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Eutheria (from Greek εὐ-, eú-'good, right' and θηρίον, thēríon 'beast'; lit. ' true beasts '), also called Pan-Placentalia, is the clade consisting of placentals and all therian mammals that are more closely related to placentals than to marsupials.
A mammary gland is an exocrine gland in humans and other mammals that produces milk to feed young offspring.Mammals get their name from the Latin word mamma, "breast".The mammary glands are arranged in organs such as the breasts in primates (for example, humans and chimpanzees), the udder in ruminants (for example, cows, goats, sheep, and deer), and the dugs of other animals (for example, dogs ...
The time when the monotreme line diverged from other mammalian lines is uncertain, but one survey of genetic studies gives an estimate of about 220 million years ago, [46] while others have posited younger estimates of 163 to 186 million years ago (though the already eutherian Juramaia is dated to 161–160 million years ago).
The mammary glands of mammals are specialized to produce milk, a liquid used by newborns as their primary source of nutrition. The monotremes branched early from other mammals and do not have the teats seen in most mammals, but they do have mammary glands. The young lick the milk from a mammary patch on the mother's belly.
Expression of the PRLR protein is found within cells of the mammary glands [10] in accordance with its role in lactation, but also is the subject of attention for its diverse and emerging roles by its expression in adipose tissue, [11] pancreatic islet cell proliferation, [12] and immune responses. [13]
Littré's glands, Morgagni's glands spongy portion of the urethra: mucous racemose 20 Lumbar glands: abdomen, near the back 21 Mammary gland: breast: milk: compound tubulo-acinar 22 Meibomian gland: eyelids: sebaceous 23 Moll's glands: eyelids: sebum 24 Montgomery's glands: mammary areola: sebaceous 25 Naboth's glands cervix and os uteri: mucous 26
Genes expressed in the eutherian placenta that are important for the later stages of fetal development are in female marsupials expressed in their mammary glands during their lactation period instead. [46] After this period, the joey begins to spend increasing lengths of time out of the pouch, feeding and learning survival skills.
Lactiferous ducts are ducts that converge and form a branched system connecting the nipple to the lobules of the mammary gland.When lactogenesis occurs, under the influence of hormones, the milk is moved to the nipple by the action of smooth muscle contractions along the ductal system to the tip of the nipple.
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