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Yolk Sac Basics A Concise Introduction to Early Development
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🥚 Embark on a journey through embryonic growth with Yolk Sac Basics: A Concise Introduction to Early Development. This quick guide unveils fundamental insights into the role of the yolk sac in supporting early embryo nutrition. Explore #YolkSacDevelopment with keywords like embryonic growth, nutrition hub, early embryology, gestational sac, fetal development, yolk sac structure, extraembryonic membrane, embryonic nourishment, prenatal development, vitelline duct, primitive gut, umbilical cord, yolk sac function, maternal-fetal exchange, embryonic support, developmental biology, fetal nutrition, and pregnancy essentials. Enhance your understanding of this crucial embryonic stage! 🌱 #EmbryoNutrition #EarlyDevelopmentExplained • this video include easy and brief description of one of the fetal membrane : yolk sac . • The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk. This is alternatively called the umbilical vesicle by the Terminologia Embryologica TE, though yolk sac is far more widely used. In humans, the yolk sac is important in early embryonic blood supply, and much of it is incorporated into the primordial gut during the fourth week of development • The yolk sac is the first element seen within the gestational sac during pregnancy, usually at 3 days gestation. • The yolk sac is situated on the front ventral part of the embryo; it is lined by extra-embryonic endoderm, outside of which is a layer of extra-embryonic mesenchyme, derived from the epiblast. • Blood is conveyed to the wall of the yolk sac by the primitive aorta and after circulating through a wide-meshed capillary plexus, is returned by the vitelline veins to the tubular heart of the embryo. This constitutes the vitelline circulation, which in humans serves as a location of haematopoiesis. The yolk sac plays no part in supporting the nutrition of the developing human embryo, which is a role solely carried by the placenta. • At the end of the fourth week, the yolk sac presents the appearance of a small pear-shaped opening traditionally called the umbilical vesicle, into the digestive tube by a long narrow tube, the vitelline duct. Rarely, the yolk sac can be seen in the afterbirth as a small, somewhat oval-shaped body whose diameter varies from 1 mm to 5 mm; it is situated between the amnion and the chorion and may lie on or at a varying distance from the placenta. There is no clinical significance to a residual external yolk sac. • for anatomy lecture notes and videos Please visit • 1. Difference between : microscopicanatomybd.blogspot.com • https://draft.blogger.com/blog/posts/... • 2. Easy humanatomy : easyhumanatomy73.blogspot.com, https://draft.blogger.com/blog/posts/... • For more anatomy creative video please visit • . 3. easy humanatomy facebook page
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