Topic11_ANS3319CPlacentation_Notes_Final_2011

Topic11_ANS3319CPlacentation_Notes_Final_2011 - 122 ANS...

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Unformatted text preview: 122 ANS 3319C Reproductive Physiology and Endocrinology Placentation Placentation & Endocrinology of Pregnancy 1) Placenta (eutherian mammals) (Figs. 14-1, 14-2, 14-3) ♦ Transient organ of pregnancy • __________________________________________________________________________ ♦ Transient endocrine gland • __________________________________________________________________________ • __________________________________________________________________________ • __________________________________________________________________________ ♦ Types of placentation • __________________________________________________________________________ ♦ _______________________________________________________________________ • __________________________________________________________________________ 2) Placental classifications ♦ Based on villi distribution over chorion • _____________________ : uniform villi distribution ♦ Sow: initial attachment day 12, established day 18-20 ♦ Mare (micocotelydons): initial attachment day 24, established day 36-38 • _____________________ : villi form zone around middle of chorion ♦ Dogs & cats • _____________________ : villi form a regionalized disc ♦ Humans, primates, rodents • _____________________ : villi located on button-like structures called cotyledons ♦ __________________________________________________________________________ • Fetal cotyledon: ________________________________________________________ • Maternal cotyledon: _____________________________________________________ ♦ Sheep: 90-100 cotyledons, day 16 initial attachment, established day 30 • Concave caruncles 123 ANS 3319C Reproductive Physiology and Endocrinology Placentation ♦ Cattle: 70-120 cotyledons, day 25 initial attachment, established day 40 • Convex caruncles ♦ ________________________________________________ (cow: up to 5-6 cm diameter) • _______________________________________________________________________ ♦ Number of placental layers between fetal & maternal circulations • Nomenclature based “prefix” & “suffix” • _____________________: maternal side “epithelio” & fetal side “chorial” ♦ Sow, mare (attachment) can include cow • _____________________ : endometrial epithelium transiently erodes & regrows (ruminant) ♦ Intermittent exposure of maternal capillaries to chorionic epithelium ♦ _________________________________________________________________________ • Sheep: day 14 Cow: day 18-20 • Migrate from chorionic epithelium, invade endometrial epithelium...
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This note was uploaded on 11/23/2011 for the course ANS 3319C taught by Professor Yelich during the Fall '07 term at University of Florida.

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Topic11_ANS3319CPlacentation_Notes_Final_2011 - 122 ANS...

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