Sinus Venosus

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Related to Sinus Venosus: cardinal vein

sinus venosus

[′sī·nəs və′nō·səs]
The vessel in the transverse septum of the embryonic mammalian heart into which open the vitelline, allantoic, and common cardinal veins.
(vertebrate zoology)
The chamber of the lower vertebrate heart to which the veins return blood from the body.

Sinus Venosus


(1) In the lancelet, which has no heart, an unpaired vessel that gathers venous blood from the portal vein and the ducts of Cuvier and passes into the abdominal aorta.

(2) In lower vertebrates—cyclostomes, fishes, and amphibians—a division of the heart; a thin-walled sac serving as a reservoir for venous blood, which, when the sinus venosus contracts, is driven into the auricle of the heart; the sinoatrial valves, located in the opening between the sinus venosus and the auricle, prevent reverse flow of blood. In the sinus venosus is found the sinus node (Remak’s ganglion), the center in which the primary impulses of heart contraction originate. In reptiles (except for Hatteria) the sinus venosus loses complete independence and enters, to one degree or another, into the structure of the right auricle. In birds and mammals the sinus venosus is formed in the embryo and subsequently (except in unkeeled birds) is completely incorporated in the wall of the right auricle, together with the sinus node; only in Monotremata are the sinoatrial valves preserved.

(3) In a number of invertebrates, the same as venous lacunae.

References in periodicals archive ?
Atrial septal defects of the sinus venosus type: surgical correction.
Sinus venosus atrial septal defect: repair with an intra superior vena cava baffle.
All patients with isolated ASD (ostium secundum, ostium primum and sinus venosus with or without PAPVD) were included.
Sinus venosus ASD (SVASD), originally described in 1858, is an interatrial communication usually located at the junction of the right atrium and superior vena cava (SVC).
The heart is somehow telling these venous cells to leave the sinus venosus and convert into coronary arteries.
But it can also be found in ostium secundum and sinus venosus type defects.
There was a small defect in the oval fossa together with an inferior sinus venosus defect; not the expected isolated secundum ASO.