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Mammalian Neonate Reproduction: Comparative Developmental Stages

Explore various mammalian neonate developmental stages: egg hatching, marsupial attachment, and mouse fetus dissected from the uterus. Learn about different reproductive strategies and placental types in mammals. Understanding the intricacies of early mammalian life.

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Mammalian Neonate Reproduction: Comparative Developmental Stages

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  1. Lecture XI: Reproduction Fig. 5.   Mammalian neonates. (a) Monotreme (echidna) hatching from its egg. (b) Newborn marsupials (Antechinusagilis) 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.

  2. Epitheliochorial • Minimal endometrial erosion • Pocket around chorionic villi • 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 • Hemoendothelial • Chorionic tissue erodes • Fetal capillaries bathed in maternal blood

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