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aorta dorsalis
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135
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506
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Human Embryo of about fourteen days, with Yolk-sac (Dorsal aorta labeled twice at left)
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Profile view of a human embryo estimated at twenty or twenty-one days old (Dorsal aorta labeled at center left)
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Each
Primitive Aorta receives anteriorly a vein—the
Vitelline Vein —from the
Yolk-sac , and is prolonged backward on the lateral aspect of the
Notochord under the name of the .
The dorsal aortæ give branches to the yolk-sac, and are continued backward through the body-stalk as the
Umbilical Arteries to the
Villi of the
Chorion .
The two dorsal aortae combine to become the
Descending Aorta in later development.
