Sinus venosus
| Sinus venosus | |
|---|---|
Cardiovascular system | |
| Identifiers | |
| Latin | sinus venosus cordis |
| TA98 | A12.0.00.016 |
| TA2 | 3911 |
| TE | venosus_by_E5.11.1.3.2.0.4, E5.11.1.5.1.0.1 E5.11.1.3.2.0.4, E5.11.1.5.1.0.1 |
| FMA | 70303 |
| Anatomical terminology] | |
The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart.[1][verification needed]
In mammals, the sinus venosus exists distinctly only in the
right atrium to form a smooth part called the sinus venarum which is separated from the rest of the atrium by a ridge called the crista terminalis. In most mammals, the sinus venosus also forms the sinoatrial node and the coronary sinus.[1][verification needed
]
Development
In the embryo, the thin walls of the sinus venosus are connected below with the
common cardinal vein.[citation needed
]
The sinus venosus 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
right atrium to form the sinus venarum.[citation needed
]
Additional images
-
Diagram to illustrate the simple tubular condition of the heart. -
Heart of human embryo of about fourteen days. -
Scheme of arrangement of parietal veins.
See also
- Atrial septal defect
- Bulbus cordis
- Ducts of Cuvier
- Primitive ventricle
- Primitive atrium
- Ductus venosus
- Truncus arteriosus
- Sinus venosus atrial septal defect
References
External links
- Anatomy photo:20:13-0102 at the SUNY Downstate Medical Center - Gross anatomy of the adult heart
- Atlas image: ht_rt_atrium at the University of Michigan Health System - "Right atrium, internal structure, anterior view"
