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Mammalian Neonates: Reproduction and Development

Explore the fascinating journey of mammalian neonates from monotremes hatching from eggs to marsupials developing in pouches and mouse fetuses at different gestational stages. Learn about the unique adaptations for prenatal nourishment and attachment.

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Mammalian Neonates: Reproduction and Development

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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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