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单词 cardinal veins
释义

Cardinal veins


(Anat.) the veins in vertebrate embryos, which run each side of the vertebral column and returm the blood to the heart. They remain through life in some fishes.

See also: Cardinal

Cardinal Veins


Cardinal Veins

 

the main paired anteroposterior veins carrying blood to the heart, well developed in the embryos of all vertebrates and man. In adults, the cardinal veins are completely developed only in rotifers, fish, and caudate amphibians.

The anterior cardinal veins, or jugular veins, collect blood from the head, while the posterior cardinal veins collect blood from the kidneys and walls of the trunk. The anterior and posterior cardinal veins merge on each side of the body to form the ducts of Cuvier. In lungfish and terrestrial vertebrates the function of the posterior cardinal veins is performed by the posterior (inferior) vena cava, which in part develops from them. The vestiges of the posterior cardinal veins are reduced in acaudate amphibians but form the vertebral and azygos veins in terrestrial vertebrates. The anterior cardinal veins are part of the anterior (superior) vena cava.

cardinal veins


car·di·nal veins

, posterior cardinal veinscommon cardinal veinsanterior cardinal veinsthe major systemic venous channels in adult primitive vertebrates and in the embryos of higher vertebrates; the anterior cardinal veins are the major drainage channels from the cephalic part of the body, and the posterior cardinal veins, from the caudal part; the common cardinal veins, formed by the anastomosis of the anterior and posterior cardinal veins, are the main systemic return channels to the heart; in the older literature, sometimes called Cuvier ducts.

car·di·nal veins

(kahr'di-năl vānz) The major systemic venous channels in adult primitive vertebrates and in the embryos of higher vertebrates; the anterior cardinal veins are the major drainage channels from the cephalic part of the body, and the posterior cardinal veins, from the caudal part; the common cardinal veins, formed by the anastomosis of the anterior and posterior cardinal veins, are the main systemic return channels to the heart.
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