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Sinus venosus

This article is about an embryological structure. For the heart defect of the same name, see atrial septal defect.
Sinus venosus
File:Gray465.png
Interior of dorsal half of heart from a human embryo of about thirty days, frontal view. (Opening of sinus venosus labeled at center top.)
File:Gray476.png
Human embryo with heart and anterior body-wall removed to show the sinus venosus and its tributaries. (Sinus venosus labeled at center left.)
Details
Latin sinus venosus cordis
Carnegie stage 9
Identifiers
Gray's p.528
Code TE E5.11.1.3.2.0.4;
E.5.11.1.5.1.0.1
TA Lua error in Module:Wikidata at line 277: attempt to index field 'wikibase' (a nil value).
TH Template:Str mid/core.html {{#property:P1694}}
TE {{#property:P1693}}
FMA Template:FMA
Anatomical terminology

The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart (where it is found between the two venae cavae); in nonmammalian chordates, however, the sinus venosus persists in the adult. In the adult, it is incorporated into the wall of the right atrium to form a smooth part called the sinus venarum, also known as the venarum sinus, which is separated from the rest of the atrium by a ridge of fibres called the crista terminalis. The sinus venosus also forms the SA node and the coronary sinus.

In the embryo, the thin walls of the sinus venosus are connected below with the right ventricle, and medially with the left atrium, but are free in the rest of their extent. It receives blood from the vitelline vein, umbilical vein and common cardinal vein.

It originally starts as a paired structure but shifts towards associating only with the right atrium as the embryonic heart develops. The left portion shrinks in size and eventually forms the coronary sinus (right atrium) and oblique vein of the left atrium, whereas the right part becomes incorporated into the right atrium to form the sinus venarum.

Additional images

See also

External links

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