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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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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