Adenosis of the breast is a condition in which the milk-producing lobules in the breast become enlarged and glands may increase in number. Mammary glands are regulated by the endocrine system and become functional in response to the hormonal changes associated with parturition. ; beta-1 integrin: One of the regulators of mammary epithelial cell growth and differentiation. Most mammary tumors in dogs often look like a ball of varying size protruding from the skin on the abdomen. 2. Mammary stem cells are multipotent adult stem cells that reside in the mammary gland, can self-renew by dividing and can differentiate into all specialised mammary epithelial cells. used ultrasound imaging to re-investigate the anatomy of the lactating breast. 18,464 results for mammaries in all View mammaries in videos (1272) 00:27 4K HD 00:11 4K HD 00:10 4K HD 00:15 4K HD 00:10 4K HD 00:13 4K HD 00:21 HD 00:10 4K HD of. Under normal conditions, the most significant expansion and differentiation of the adult mammary gland occurs in response to systemic reproductive hormones during pregnancy and lactation to enable. 23674217. Vaginal smears were obtained daily before and. The equine udder comprises one pair of mammae each with a teat. The hip-hop artist has shared pics of herself gracing the cover of Elléments Magazine. In patients with breast pain, the. 2K People always wonder how I have such a strong relationship with my son, and I truly believe that the answer to that is because I respect him the way I want to be respected and I don’t look at him as below me. original sound - EX7STENCE™. Can go hand-in-hand with a Pregnant Reptile. Lactation. See examples of MAMMARY used in a sentence. 2, the internal reproductive organs include the vagina, uterus, Fallopian. About half of all tumors in female dogs are mammary tumors. These hormones promote gland development from puberty onwards and induce the formation of a branched, epithelial, milk-secreting organ by the end of pregnancy. Mammary tumors are rare in cows, mares, goats, ewes, and sows. Hughes’ wildly expensive and lethally overheated PR campaign for Russell’s debut vehicle “The Outlaw” created long-running censorship wars because the marketing campaign played up. 3 (G,H) and 3% (I,J), or 0. Various imaging techniques may be applied in research or clinical practice to evaluate pathological conditions of mammary glands and contribute to a diagnosis. The mammary gland has evolved from epidermal apocrine glands, the skin glands as an accessory reproductive organ to support postnatal survival of offspring by producing milk as a source of nutrition. Animals were given PM at doses of 0 (C,D), 0. Occasionally, milk lines will persist and may be connected to extra breast tissue and. —> ENROLL NOW! <—. The ectoderm layer forms the neural tube that closes at six weeks of gestation. Yes, dolphins are classified as mammals and not fish. TikTok video from Mamariles (@mamariless). One visitor to the Inokashira Park Zoo outside of Tokyo got an unusual sight early this month: A squirrel with what appears to be large mammary glands. Much. The malleus originated from the articular bone, whereas the incus originated from the quadrate bone. Sort of like milk, but permanent. Lactation is the process by which milk is synthesized and secreted from the mammary glands of the postpartum female breast in response to an infant sucking at the nipple. The company is owned by Bright Mountain Media Inc. N. (credit: NCI)The left-hand sample is the first milk produced by the mother while the right-hand sample was produced later during the same pumping. Thelarche refers to rapid breast tissue development at puberty. The breast is made up of the nipple and areola on the outside, and milk ducts, lobes, lobules, lymph. The adult breast has nearly 14-18 lactiferous lobes. Whereas mammary gland enlargement is frequently the result of pathological changes, drug treatment may produce an increase in mammary gland size analogous to the physiological changes seen in pregnancy or lactation. I have met some incredibly talented people along the way in such a short space of time. Of or relating to a breast or mamma. Part of how the mammary gland fulfills its function of producing and delivering adequate amounts of milk is by forming an extensive tree-like network of branched ducts from a rudimentary epithelial bud. The microenvironment surrounding mammary tissue plays a pivotal role in the gland development, predominantly via regulation of epithelial-to-mesenchymal transition (EMT), during which epithelial cells lose cell polarity and cell adhesion to become mesenchymal cells with migration and invasion properties. To date, many studies have examined the role of women (players, characters and content producers) in video games and have. The mammary gland is a compound, branched tubuloalveolar structure and a major characteristic of mammals. 2. These macrophages are monocyte. Stage 2. RUN DOWN. Externally, each breast has a raised nipple, which is surrounded by a. Mammary duct ectasia is when the milk ducts under the nipple become clogged up with fluid. NCI's Dictionary of Cancer Terms provides easy-to-understand definitions for words and phrases related to cancer and medicine. @roap12. Mastitis can occur in one or both mammary glands in the udder. Avoiding nursing. The gland undergoes. 532 Likes, TikTok video from Mamariles (@mamariless). r/bigmommymilkers: We want thicc gamer mommy gfs with big mommy milkers to help change change our diapersAmphibians – Definition, Characteristics and Classification. They are named for Astley Cooper, who first described them in 1840. Breast changes continue to happen over a woman’s life. The nipple appears as a small pit in the center of a thickened areola containing a few glands of Montgomery. Breast/mammary cancer is the most frequently diagnosed cancer in women and in female dogs [1,2]. With the exception of platypuses and echidna, mammals give birth to live young. In females, it serves as the mammary gland, which produces and secretes milk to feed infants. Stage 3. The areolas, the darker circular area around the nipple, are located where the mammary gland ducts reside in women's breasts. Wnts: Morphogenic signaling proteins that regulate cell-cell interactions. Most mammals have three distinct kinds of hair: guard hairs, underfur, and whiskers. The number of mammaries is almost always even, but a notable exception is the Virginia possum, which has thirteen. The mammary glands have a large blood supply, and veins are more extensive than arteries. Some transgender men and nonbinary people use the term chestfeeding or bodyfeeding rather than breastfeeding. doi: 10. Goats were fasted for 12 h and then received a 33-h abomasal infusion of an. In human breast neoplasms, a highly invasive and treatment-resistant protein, responsible for malignant evolution, has been identified. Structure of the nipple (left) with three milk ducts, and the teat (right) with a secondary canal and three milk ducts. Oily phans on IG : itsmamariles. A breast infection caused by inflammatory breast cancer also causes redness and. Rather, they are avians. Only the tip of the nipple is raised. The dark area of skin around the nipple (the areola) gets larger. 1023/a:1022860902083. There are only 13 publications describing mammary gland neoplasms, with only 16 reported carcinomas and a carcinoma prevalence rate of 0. 6. Like hair, mammary glands are uniquely mammalian. Development of the Human Breast. Mammary tumor. Oily phans on IG : itsmamariles. pedro roa #PorMéritoNoPalanca #TeamCCA. Buds appear, and breast and nipple are raised. NOT a page for fans of Riley. The thoracic (chest) mammary glands receive their arterial. The mammary gland is a compound, branched tubuloalveolar structure and a major characteristic of mammals. The meaning of MAMMALIA is the highest class of the subphylum Vertebrata comprising humans and all other animals that nourish their young with milk secreted by mammary glands, that have the skin usually more or less covered with hair, a mandible articulating directly with the squamosal, a chain of small ear bones, a brain with four optic lobes, a muscular diaphragm separating the heart and. The mammary gland is a compound, branched tubuloalveolar structure, and a major characteristic of mammals. They are arranged like the petals of a daisy. Fig. In the literature, HMG is also called mastopathy, fibroadenosis, fibrocystic breast disease, mastalgia. relating to the breasts or milk organs 2. This study aimed to describe the expression profiles of microRNAs (miRNAs) from mammary gland tissues collected from dairy cows with Streptococcus agalactiae-induced mastitis and to identify differentially expressed miRNAs related to mastitis. While it is more commonly a bacterial infection, fungal infections can also occur. Though it is present in both sexes, it is well developed in females and rudimentary in males. These cells change morphology as they move toward the surface and are ultimately sloughed off. Each lobe has many smaller structures called lobules. Each lobe contains milk-producing glandular structures and multiple. Expression of extra mammary glands. Worsening mastitis in cats causes symptoms like: Fever. They emerge in pairs from sweat glands that have been modified. 954. Externally, each breast has a raised nipple, which is surrounded by a circular. Introduction To Mammary Glands – Meaning. Development includes puberty, pregnancy, and lactation. Simple columnar epithelium. TikTok video from Mamariles (@mamariless). 70 Following. This is a benign condition, meaning it is not cancerous. The mammals are the class of vertebrate animals characterized by the production of milk in females for the nourishment of young, from mammary glands present on most species and specialized. Mammary (Breast) Tumors in Dogs. Lobes. 6. Hormones control milk production during pregnancy and. Butterfly Keloid. These stages are influenced by a cascade of physiologic changes that are crucial to successful. The mammary gland has evolved from epidermal apocrine glands, the skin glands as an accessory reproductive organ to support postnatal survival of offspring by producing milk as a source of nutrition. Nipple and mammary gland (swelling) is a common symptom that has a number of causes. GQ Recommends. Both females and males develop breasts from the same embryological. 002. However, direct study of IMI impacts on non-lactating but. The breast has an inhomogeneous structure that is predominantly composed of adipose tissue and glandular tissue. Peaches & Eggplants (feat. To celebrate the beautiful, breasts, boobs, tits of older women. Slide show: Female breast anatomy. The dense cluster of mammo-pilo-sebaceous units that open onto a nipple. The anatomy of the female breast is complex and intricate. The mammary gland and teat of domestic animals is collectively called udder. The normal physiology of lactation is a process that begins to take effect well before the initial latch of the newborn infant. 7522. , involution), and induces a. Sperm are produced in the testes and are transported through the reproductive ducts. In addition, there are also suspensory Cooper's ligaments and connective tissue such as collagen and elastin. Mammary glands are influenced by hormones activated in puberty. Created Sep 23, 2022. Watch the latest video from. Results from a mouse study suggest that pregnancy primes the mammary gland for increased milk production in future pregnancies through epigenetic. When mammary glands mature fully in females during puberty, they develop into a state where a hormonal spike-most notably of prolactin-can easily induce lactation. [2] Breast blood supply comes from three sources: Branches of the axillary artery supply the lateral part of the breast. All mammals have a placenta. Mastitis is a term used to describe inflammation of a mammary gland (breast). - each lobe is drained by a single lactiferous duct that opens into the nipple. From the 70 s, in vitro mouse mammary culture evolved from basic monolayers of cells to complex 3D culture systems considering the importance of the cell polarization and microenvironment. Functionally, the mammary glands produce milk; structurally, they are modified sweat glands. Feline mammary hyperplasia is a benign, progesterone-associated fibroglandular proliferation of one or more mammary glands that may occur in both the female and male cat. Fig. The parenchyma forms a system of branching ducts eventually leading to secretory acini development and the stroma consists mainly of adipose tissue, providing the environment for development of the parenchyma. Lobes. Royals. 2K Likes, 23 Comments. The lobules produce milk that flows through the mammary ducts into the nipples. The mammary gland develops through several distinct stages. The following 13 files are in this category, out of 13 total. 19. The extent of epithelial proliferation within the gland is massive and often occurs during a very short interval; this topic has been reviewed extensively elsewhere (Hovey et al. Heterogeneity within the mouse mammary epithelium and potential lineage relationships have been recently explored by single-cell RNA profiling. Anatomical terminology. Breast milk contains all the nutrients that an infant needs in the first 6 months of life, including fat, carbohydrates, proteins, vitamins, minerals and water (1,2,3,4). Mastitis is caused by the introduction of bacteria into a mammary gland via nursing, trauma, or hematogenous spread. A blue whale's mammary glands are the largest in the world. Anatomy and physiology of animals reproduction Mammary gland. Though it is present in both sexes, it is well developed in females and rudimentary in males. To meet neonatal nutritional requirements, specific receptors and intracellular transport pathways [3] within the sMECs are used to transfer nutrients and milk component precursors from the serum across the basal plasma membrane to sites of synthesis or secretion. 464 Likes, TikTok video from Mamariles (@mamariless). 1: Bones of the mammalian inner ear: Bones of the mammalian inner ear are modified from bones of the jaw and skull. mammary gland: A gland that secretes milk for suckling an infant or offspring. The mammary gland is a compound, branched tubuloalveolar structure and a major characteristic of mammals. Peaches & Eggplants (feat. The production of breast milk initiates in larger amounts between 2 and 4 days after the birth of the baby and the breastmilk is said to have 'come in'. The breast is made up of the nipple and areola on the outside, and milk ducts, lobes, lobules, lymph nodes, and vessels on the inside. Murine mammary gland is an ideal model for studying the development and milk synthesis in dairy animals. Robert D. Previous Next 1 of 6 Female breast anatomy. Mammary glands are the organs that, in the female mammal, produce milk for the sustenance of the young. This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids. They arch down from the armpit to the groin on both sides. They are common in un-spayed dogs and dogs spayed after their first heat cycle. Macrophages contribute to the different phases of mammary gland remodeling during. mammary definition: 1. 6A. The mammary glands swell and become very painful for the dog. Learn more. This review takes a brief look at the external genitalia and glands that female humans have. Other articles where areola is discussed: pregnancy: Breasts:. Each gland consists of a series of lobules, or glands that produce milk. The mammary epithelium comprises two primary cellular lineages, but the degree of heterogeneity within these compartments and their lineage relationships during development remain an open question. 5K Likes, TikTok video from Mamariles (@mamariless). R. 15-20 lobes separated by adipose tissue. Mammary Gland stock photos are available in a variety of sizes and formats to fit your. When comparing feline and canine mammary glands, the first three pairs would be thoracic and the caudal pair abdominal or inguinal; numbered first to fourth. Only the tip of the nipple is raised. she was in a relationship with drew, her baby daddy. The thoracic (chest) mammary glands receive their arterial blood. The teat sinuses are small uniformly wide passages. Mamariles Retweeted. We would like to show you a description here but the site won’t allow us. It is a common finding in older female dogs and cats that are not spayed, but they are found in other animals as well. You can help close down the milk bar by helping the puppies go through the weaning process and making some changes to mom's diet. Mammary tumors occur more frequently in breeds such as toy and miniature poodles, spaniels and German shepherds. Whereas male breast cancer remains a rare disease, gynecomastia, a condition that arises due to abnormal development and growth of the male breast epithel. Hsin-Jung Wu. The mammary gland development begins. In most cases, mastitis is caused by a bacterial infection. Supernumerary or accessory breasts, which may or may not have nipples. Areola. Cooper's ligaments. Do whales produce milk? Do whales have nipples? What's whale milk like? How does it all work underwater? Find out here!The most common clinical sign of a malignant mammary tumor is one (or more) palpable masses underneath the skin of the abdomen. 1 29. The epithelium is constantly replacing itself by division of the basal layer of cells. Female mammals produce milk for their offspring and thus spend a good portion of their time and energy raising their. No, birds are not mammals. 18,464 results for mammaries in all. Good sense of hearing as mammals are aided with 3 middle ear bones. The milk-producing cells arise primarily during pregnancy and comprise the alveolar lineage. Given this function, it is only during a pregnancy/lactation cycle that the gland reaches a mature developmental state via hormonal influences at the cellular level that effect drastic modifications in the micro- and macro. Learning Objectives. Staphylococcus aureus is the most common bacteria isolated. mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. 110K Followers, 3,431 Following, 393 Posts - See Instagram photos and videos from Riley nipper (@itsmamariles)Here are a few symptoms you might see in dogs who suffer from mastitis: Firm, swollen, or painful mammary glands. Milk is a white liquid food produced by the mammary glands of mammals. All mammals possess mammary glands. The milk lines themselves appear by the sixth week. Normal structure of the breasts. she’s a big only fans girl. com Snap:mamariless. Mammary gland development occurs mainly after birth and is composed of three successive stages: puberty, pregnancy and lactation, and involution. As part of this cancer. The capacity to supply fluid and perhaps nutrients to eggs would be promoted and enhanced by incorporation of antimicrobials into the fluid. The reproductive system also. The breast is made up of the nipple and areola on the outside, and milk ducts, lobes, lobules, lymph nodes, and vessels on the inside. The mammary glands are one of the distinguishing features found on mammals. Females that have mammary glands are from the class Mammalia, or commonly called, mammals. here is just a brief run down of the past month or so, when i really started to realize something was off. These may have been antimicrobials already produced in the skin, as in amphibian skin, and evolutionary pressure would probably have fostered the incorporation of molecules such as lysozyme and iron-binding proteins into the secretion, components that are. Location of mammary gland is described as inguinal, abdominal or thoracic. Mammary Glands. The dark area of skin around the nipple (the areola) gets larger. Usually hormones like estrogen, placental lactogenic, progesterone, prolactin and oxytocin are involved in the process of lactation. In humans, the breast is an example of a sexually dimorphic structure both in overall appearance as well as in tissue organization. TikTok. 1 Introduction. Stage 4. Cats have eight nipples, which run along the underside of the body in rows of two. We provide a brief overview of the development and anatomy of nipples and mammary glands in monotremes. Those lobes are themselves composed of a number of terminal duct lobular units made of secretory alveoli and converging ducts 1. Mammary glands are found in both sexes, but cease development in males well before puberty. The mammary glands in dogs and cats are associated with their nipples and extend from the underside of the chest to the groin on both sides of the. original sound - EX7STENCE™. Peter Greaves MBChB FRCPath, in Histopathology of Preclinical Toxicity Studies (Fourth Edition), 2012. Other tissues in the mammae include theNature Reviews Immunology (2023) Macrophages are involved in immune defense, organogenesis and tissue homeostasis. According to a study published in the Journal of Plastic and Reconstructive Surgery- which involved asking over 1,300 people to look at pictures of naked boobies and rank them by hotness (stop laughing, this is serious research!)-people preferred a more "real" and "normal" look from their silicone, with the ideal breast shape having a 45:55 ratio. The dog is by far the most frequently affected domestic species, with a rate that is about 3 times that found in women. ydbio. Branches of the internal thoracic artery, supply the medial part of the breast as the medial mammary arteries. The mammary duct is an enlarged sweat gland. Based on gene expression profiling, breast tumors can be classified into five subtypes: Luminal A (expressing estrogen and progesterone receptors; ER +. D. Recommended. The veins beneath the skin over. The liquid is also very rich in all the nutrients vital for the calf’s growth. 1016/j. The first thing to develop are lobes, or small subdivisions of breast tissue. They are made up of 2 primary parts: a coiled secretory structure and an accompanying straight duct. Kohei Saeki et al. It is also a vital accessory organ. Human breasts can become so. The Brain Size of a Cow. 110K Followers, 3,431 Following, 393 Posts - See Instagram photos and videos from Riley nipper (@itsmamariles)Mamariles (@mamariless) on TikTok | 1M Likes. Most likely, it evolved as a sexual signal communicating fertility (1). As it turns out, yes, it can, and it’s more likely in human men than in the vast majority of mammals. Mammary glands are present in the breast tissue of both males and. The transition from pregnancy to lactation is a critical event in the survival of the newborn since all the nutrient requirements of the infant are provided by milk. e. Mammals have a four-chambered heart. 5% risk of developing mammary tumors. 002. These end in dozens of tiny bulbs that can produce milk. Functionally, the mammary glands produce milk; structurally, they are modified sweat glands. Both females and males develop breasts from the same embryological tissues. The mammaries are covered by a stratified squamous keratinized. 7K Followers. 1016/j. Mammary glands or breasts are actually sweat glands that have been modified according to hormonal stimulation. Supernumerary nipples are congenital, and usually harmless. The breast has an inhomogeneous structure that is predominantly composed of adipose tissue and glandular tissue. Preteen. Other signs of illness such as fever and depression may occur. Background Both male and. The nipple: a simple intersection of mammary gland and integument, but focal point of organ function. The normal physiology of lactation is a process that begins to take effect well before the initial latch of the newborn infant. In the most viral clip with more than 2. The mammary gland is a dynamic organ, regulated by the coordinated actions of reproductive and metabolic hormones. Cats normally have eight mammary glands, four on each side: two thoracic (T1, T2) and two abdominal (A1, A2; A2 also referred to as the inguinal or the second abdominal mammary gland). The organs of the female reproductive system are specialized to produce ova (eggs), transport the egg cells to the site of fertilization, to provide a favorable environment for developing embryos, and to move offspring outside of the body (birth) at the appropriate time. Discoloration of the teats. mammary: [adjective] of, relating to, lying near, or affecting the mammae. The lobes, lobules, and bulbs are all linked by thin tubes called ducts. The coiled secretory structure, which is the gland itself, is located in the lower dermis or the subcutaneous fat and is composed only of secretory cells. They develop from bilateral ectodermal thickenings that form milk lines extending from the neck to the inguinal region. 1 29. Promoter regions with both nulliparous and parous DMRs are represented in blue (present in both). The female breast consists of 10–20 lobes that are surrounded by connective and. Cardiff, Kimberly H. The term "breast" is sometimes used to refer to the area at the front of the chest. Externally, each breast has a. From: Obstetrics and Gynecology Clinics of North. boobs. Cloudy or thick milk. Regulated by epithelial/mesenchymal interactions, the placodes descend into the underlying mesenchyme and produce the rudimentary ductal structure of the gland present at birth. Pus or discharge from the teats. This is in contrast to the cow which. During the first trimester, the ductal system expands and branches out into the adipose tissue in response to the increase of estrogen. The adductor muscle that closes the jaw is composed of two muscles in mammals: the. In this stu. This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids. relating to the breasts or milk organs 2. It requires the breast to change in composition, size, and shape during each stage of female development. mammary gland , Milk-producing gland of female mammals, usually present but undeveloped and nonfunctional in males. Sometimes. Whole mounts of mammary gland are an inexpensive method to capture the progression of morphological changes that may arise after environmental pollutants exposure (Tucker et al. Female Breast Developmental Stages. The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Introducing the 2023 GQ Men of the Year Issue, Starring Jacob Elordi, Tom Ford, and More. 58. Compare Lactating Male, Sexy Dimorphism, Organic Bra, Multiboobage, Secondary Sexual Characteristics, Tertiary Sexual Characteristics, and. The organ's primary function is to secrete milk. Pubertal changes lead to incomplete development of the breast , a process which is only completed during pregnancy . Mastitis is an infection of the mammary glands in nursing female animals. The mammary gland is shown at key developmental and lactational stages, including. Mammary glands, which are located in the breast overlying the pectoralis major muscles, are present in both sexes, but usually are functional only in the female. Figure 28. a gallery curated by sharontvbell. TikTok/@ billiebopbillie. Causes include: Pregnancy. Whale milk has an unusually high-fat content of 35% to 50% fat in many species. The lower jaw of mammals consists of only one bone, the dentary, and the jaw hinge connects the dentary to the squamosal (flat) part of the temporal bone in the skull. Mammary Glands. Our. The mammary gland provides a spectacular example of physiological cell death whereby the cells that produce milk during lactation are removed swiftly, efficiently, and without inducing inflammation upon the cessation of lactation. Figure 1. It's not necessarily a hard limit, but survival tends to drop noticeably when number of offspring being nursed exceeds number of mammaries. Three-D and organoids cell culture developments made with murine mammary cells have promptly been adapted to human cells for similar. Thus each teat typically has two orifices through which the main ducts discharge (Fig. These periods of. [1] The process of feeding milk in all. 3. Follow. They characterize key life stages in which the mammary gland undergoes complex. In development, the mammillary bodies form from the ectoderm layer. Strands of connective tissue that run between the skin and fascia and support the breast. At birth, the breast is composed of radially arranged mammary lobes draining via lactiferous ducts into ampullae that empty onto the nipple. Daniel G. 532 Likes, TikTok video from Mamariles (@mamariless). The INHAND Project (International Harmonization of Nomenclature and Diagnostic Criteria for Lesions in Rats and Mice) is a joint initiative of the Societies of Toxicologic Pathology from Europe (ESTP), Great Britain (BSTP), Japan (JSTP), and North America (STP) to develop an internationally accepted nomenclature for proliferative. Specifically, computed tomography, positron emission tomography,. The fat fills out the breast tissue, giving it shape. 1: Bones of the mammalian inner ear are modified from bones of the jaw and skull. Most living mammals are monotremes. The breasts are the most prominent superficial structures in the anterior thoracic wall consisting of glandular tissue and a supporting fibrous and fatty matrix. jpg 401 × 234; 19 KB. There are differences in both biologic behavior and histology of mammary tumors in dogs and cats. Introduction. . Stage 1. Discoloration of the teats. Structure. Molecular mechanism of mammary gland involution: An update. Three-dimensional (3D). It is the primary source of nutrition for young mammals (including breastfed human infants). Mammals are warm-blooded and have a 4-chambered heart. The milk-secreting cells of the mammary gland develop through the proliferation of epithelium into hollow structures called alveoli. A mammary tumor is a tumor of the mammary tissue. mammary definition: 1. , platypus), milk is. Mammary gland hyperplasia is a benign condition in which an an excessive amount of tissue grows, resulting in enlarged masses in the mammary glands.