The dorsal aortae are paired (left and right) embryological vessels which progress to form the
descending aorta. The paired dorsal aortae arise from
aortic arches that in turn arise from the
aortic sac
The aortic sac or aortic bulb is a dilated structure in mammalian embryos, lined by endothelial cells and is the most distal part of the truncus arteriosus. It is the primordial vascular channel from which the aortic arches arise (and eventually th ...
.
The primary dorsal aorta is located deep to the lateral plate of
mesoderm
The mesoderm is the middle layer of the three germ layers that develops during gastrulation in the very early development of the embryo of most animals. The outer layer is the ectoderm, and the inner layer is the endoderm.Langman's Medical E ...
and move from lateral to medial position with development and eventually will fuse with the other dorsal aorta to form the
descending aorta.
Each
primitive aorta
Primitive may refer to:
Mathematics
* Primitive element (field theory)
* Primitive element (finite field)
* Primitive cell (crystallography)
* Primitive notion, axiomatic systems
* Primitive polynomial (disambiguation), one of two concepts
* Prim ...
anteriorly receives the
vitelline vein
The vitelline veins are veins that drain blood from the yolk sac and the gut tube during gestation.
Path
They run upward at first in front, and subsequently on either side of the intestinal canal. They unite on the ventral aspect of the canal.
B ...
from the
yolk-sac, and is prolonged backward on the lateral aspect of the
notochord
In anatomy, the notochord is a flexible rod which is similar in structure to the stiffer cartilage. If a species has a notochord at any stage of its life cycle (along with 4 other features), it is, by definition, a chordate. The notochord consis ...
under the name of the dorsal aorta.
The dorsal aortae give branches to the yolk-sac, and are continued backward through the body-stalk as the
umbilical arteries to the
villi of the
chorion.
References
External links
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{{Authority control
Embryology of cardiovascular system
Aorta