sinus venosus
The 'sinus venosus' is an important structure in the circulatory systems of lower vertebrates and in the embryonic development of higher vertebrates.
🇺🇸 US Voice:
🇬🇧 UK Voice:
Definition
C2Zootomy
(technical, academic)The initial chamber of the heart in fish, amphibians, and reptiles, which empties into the right atrium.
Example
- In fish, the sinus venosus collects blood returning from the body before passing it to the atrium.
C2Embryology
(technical, academic)A structure in the embryonic heart that later contributes to forming parts of the mature heart, such as the sinoatrial node and the coronary sinus.
Example
- During early development, the sinus venosus plays a crucial role in directing blood flow in the embryonic heart.