. Embryology. Embryology; Embryology; genealogy. VITELLINE VEIN Fig. 152. The limb buds. Just posterior to the heart the somatic mesoderm thickens considerably to form the mesenchyme of the wing buds. The midgut at this point is still open to the yolk and the endoderm is relatively undifferentiated. The section passes through the vitelline veins, which bring blood from the vascular area over the yolk to the ductus venosus and thence to the heart. A dorsal aorta and two posterior cardinal veins are present. The posterior cardinal veins are close to the developing mesonephros. The relation of th
. Embryology. Embryology; Embryology; genealogy. VITELLINE VEIN Fig. 152. The limb buds. Just posterior to the heart the somatic mesoderm thickens considerably to form the mesenchyme of the wing buds. The midgut at this point is still open to the yolk and the endoderm is relatively undifferentiated. The section passes through the vitelline veins, which bring blood from the vascular area over the yolk to the ductus venosus and thence to the heart. A dorsal aorta and two posterior cardinal veins are present. The posterior cardinal veins are close to the developing mesonephros. The relation of the veins to the mesonephros was discussed in Chapters 12 and 14. MESONEPHROS. VITELLINE ARTERY DORSAL AORTA Fig. 153. The somites and mesonephros. The somites continue their dif- ferentiation into a compact layer of dermatome, a less conspicuous layer of myotome, and a diffuse mass of sclerotome. The nephrotome has developed into a mesonephric duct and mesonephric tubules. The duct is lateral to the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
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