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EVOLUTION OF THE MAMMARY GLAND AND SECRETIONS

MAMMARY GLAND. Gland of ReproductionDevelopment is tied to hormones and physiology of reproduction. Purpose is to nuture young!! Huge female expenditure for something outside their own body! Develop offspring/ species survival!. . GIVE A 1 WORD DEFINITION FOR THIS COURSE!. MAMMALS!. . MAMMALS.

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EVOLUTION OF THE MAMMARY GLAND AND SECRETIONS

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    1. EVOLUTION OF THE MAMMARY GLAND AND SECRETIONS Why is the mammary gland really a gland of reproduction?

    2. MAMMARY GLAND Gland of Reproduction Development is tied to hormones and physiology of reproduction. Purpose is to nuture young!! Huge female expenditure for something outside their own body! Develop offspring/ species survival!

    3. GIVE A 1 WORD DEFINITION FOR THIS COURSE! MAMMALS!

    4. MAMMALS mamma: latin word - breast / milk gland Kingdom: Animals Phylum: chordata Sub phylum: vertebrae Class: mammalia > 4400 species ( good info on ~150) Evolved 250 million years ago (dinosaurs- 65)!

    6. MAMMALS WHAT ARE 2 DISTINCT FEATURES OF MAMMALS? HAIR? MAMMARY GLANDS!

    8. SUBCLASS: PROTOTHERIA NO PLACENTA Egg laying mammals Lactation preceded placentation! One order: Monotremata 3 species? Mammary glands: no teats! Tubules with myoepithelial tissue Young have strong forepaws/ poorly developed hindlimbs

    9. Duckbill Platypus

    13. ECHIDNA

    14. SUBCLASS: THERIA HAVE PLACENTA!

    15. METATHERIA Give birth to live young but not a true placenta: chorio-vitelline One order: Marsupials Pouched animals 3-4 week gestation Embryo born w/ highly dev. forepaws Adaptation: animals move/ forage

    19. MARSUPIALS

    20. EUTHERIAN > 95 % OF ALL MAMMALS TRUE PLACENTA! Extract nutrients from maternal blood! 21 orders ( see Dr. Anderson paper) Born more mature Lactations from 4 days to years!

    21. EUTHERIAN

    22. EUTHERIAN

    23. FUTURE THOUGHTS What do mammals have in common: - hair - mammary glands * development and tissue * secretion products

    24. EUTHERIAN

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