Fig. 5. Mammalian neonates. (a) Monotreme (echidna) hatching from its egg. (b) Newborn marsupials (Antechinus agilis) attached to mother’s teats in pouch.

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Fig. 5. Mammalian neonates. (a) Monotreme (echidna) hatching from its egg. (b) Newborn marsupials (Antechinus agilis) attached to mother’s teats in pouch. Inset, individual neonate. (c) Newborn marsupial (tammary wallaby) attached to mother’s teat in pouch. (d) A 14.5-day post- coitus mouse fetus dissected from the uterus. Lecture XI: Reproduction

Epitheliochorial Minimal endometrial erosion Pocket around chorionic villi maternal blood Hemoendothelial Chorionic tissue erodes Fetal capillaries bathed in maternal blood Endotheliochorial Epithelium and connective tissue erode Chorionic villi in direct contact with maternal capillaries Hemochorial Maternal tissue erodes Chorionic villi bathed in maternal blood

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