ANS3319CPlacentation_Key_Final_Topic13 - ANS 3319C...

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ANS 3319C Reproductive Physiology and Endocrinology Placentation 121 Placentation & Endocrinology of Pregnancy 1) Placenta (eutherian mammals) (Figs. 14-1, 14-2, 14-3) Transient organ of pregnancy Provides metabolic interface between conceptus & dam Transient endocrine gland Maintains pregnancy (+) fetal & mammary gland growth Induction of parturition Types of placentation Implantation: conceptus buries into uterine endometrium Totally invasive & semi-invasive Attachment: placenta attaches to uterine epithelium 2) Placental classifications Based on villi distribution over chorion Diffuse : uniform villi distribution Sow: initial attachment day 12, established day 18-20 Mare (micocotelydons): initial attachment day 24, established day 36-38 Zonary : villi form zone around middle of chorion Dogs & cats Discoid: villi form a regionalized disc Humans, primates, rodents Cotyledonary : villi located on button-like structures called cotyledons Placentome: point of interface between fetal & maternal cotyledons Fetal cotyledon: trophoblastic origin, contributed by chorion Maternal cotyledon: caruncular region of uterus Sheep: 90-100 cotyledons, day 16 initial attachment, established day 30 Concave caruncles
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ANS 3319C Reproductive Physiology and Endocrinology Placentation 122 Cattle: 70-120 cotyledons, day 25 initial attachment, established day 40 Convex caruncles Cotyledons diameter w/ conceptus age (cow: up to 5-6 cm diameter) placental surface area nutrient transfer Number of placental layers between fetal & maternal circulations Nomenclature based “prefix” & “suffix” Epitheliochorial : maternal side “epithelio” & fetal side “chorial” Sow, mare (attachment) can include cow Syndesmochorial
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This note was uploaded on 07/16/2011 for the course ANS 3319 C taught by Professor Yelich during the Spring '11 term at University of Florida.

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ANS3319CPlacentation_Key_Final_Topic13 - ANS 3319C...

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