![]() Thin layer of tissue surrounding the embryo. Cross Section of the 72 Hour Chick Embryo through the head and heart. Through the trunk region of 48 hours chick embryo with lateral body fold Neural tube Notochord Somite Amniotic folds Embryonic coelom Dorsal aorta. At the end of 48 hours chick twisting will reach the cervical flexure. As the development proceeds the anterior end of embryo is turns towards right and hence the anterior part of embryo comes to lie on the left side of yolk. ![]() Its ventral surface is in contact with yolk. Torsion: The 24 hours chick embryo is flat. Eventually the rest of the body will twist to the left so that the embryo is lying on its left side atop the yolk. The embryo has turned its head and bent it toward the yolk, so that the left side of its head rests on the yolk sac (like a pillow). A 48 Hour Embryo The chick embryo has almost doubled in length from 33 to 48 hours. ![]()
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