Sinus Venosus

(redirected from Venosus)
Also found in: Dictionary, Medical.
Related to Venosus: sinus venosus, Ligamentum venosum

sinus venosus

[′sī·nəs və′nō·səs]
(embryology)
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 ?
Abbreviations SSS --sick sinus syndrome SND --sinus node dysfunction ASD --atrial septal defect ECG --electrocardiogram DDDR --dual chamber rate adaptive pacemaker CHD --congenital heart disease SVASD --sinus venosus atrial septal defect
Ductus venosus Doppler (DVD) measurements were obtained throughout the 6-month period from women who underwent amniocentesis procedures due to increased risk for trisomy 21 in terms of first or second trimester screening test results.
Effects of sympathetic nerve stimulation on membrane potential, [Ca2+]i and force in the arrested sinus venosus of the toad, Bufo marinus.
For right sided PAPVC to SVC and sinus venosus ASD, patch baffling has been described between the right sided anomalous pulmonary veins and left atrium along with with an additional patch to augment SVC.
daurica (Uvarov, 1928) is removed from the synonymy with Peltastes venosus Fischer von Waldheim, 1839.
Ductus venosus waveforms are time consuming and require a skilled sonographer whereas using middle cerebral artery waveforms diagnose only an advanced fetal hypoxic stage1.
Thrombi generally occur in the hepatic system, ductus venosus, inside the right atrium, and inside the superior or inferior vena cava (15-19).
III Fetal Doppler waveforms Critical abnormal values (Absent or reversed flow umbilical artery diastolic flow, reversed ductus venosus a-wave flow, pulsatile umbilical vein flow).
The aryl hydrocarbon receptor is required for developmental closure of the ductus venosus in the neonatal mouse.
Lesions associated with the plexus venosus subcutaneous collaris of pigeons with chlorophacinone toxicosis.
Other structural features of the developing foetuses observed in all stages were presence of ductus venosus and ductus arteriosus in the liver and heart respectively.