During development of the veins, the first indication of a
parietalParietal may refer to:*Parietal placentation*Parietal lobe of the brain*Parietal bone of the skull*Parietal scales of a snake lie in the general region of the parietal bone.*Parietal cell in the stomach*Parietal pleura*Parietal pericardium...
system consists in the appearance of two short transverse veins, the
ducts of CuvierDuring development of the veins, the first indication of a parietal system consists in the appearance of two short transverse veins, the ducts of Cuvier , which open, one on either side, into the sinus venosus. Each of these ducts receives an ascending and descending vein...
, which open, one on either side, into the
sinus venosusThe sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In humans, it exists distinctly only in the embryonic heart, where it is found between the two venae cavae...
. Each of these ducts receives an ascending and descending vein. The ascending veins return the blood from the parietes of the trunk and from the Wolffian bodies, and are called
cardinal veins.
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During development of the veins, the first indication of a
parietalParietal may refer to:*Parietal placentation*Parietal lobe of the brain*Parietal bone of the skull*Parietal scales of a snake lie in the general region of the parietal bone.*Parietal cell in the stomach*Parietal pleura*Parietal pericardium...
system consists in the appearance of two short transverse veins, the
ducts of CuvierDuring development of the veins, the first indication of a parietal system consists in the appearance of two short transverse veins, the ducts of Cuvier , which open, one on either side, into the sinus venosus. Each of these ducts receives an ascending and descending vein...
, which open, one on either side, into the
sinus venosusThe sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In humans, it exists distinctly only in the embryonic heart, where it is found between the two venae cavae...
. Each of these ducts receives an ascending and descending vein. The ascending veins return the blood from the parietes of the trunk and from the Wolffian bodies, and are called
cardinal veins.
There are three cardinal veins: anterior, common, and posterior.
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Category:Embryology