What is the sinus venarum?
The posterior part of the right atrium is termed the sinus venarum; also, it includes most of the lateral wall of the chamber. It has a relatively smooth surface compared to the anterior part. The posterior and anterior walls merge at the crista terminalis.
What are the sinuses in the brain?
There are four paranasal sinuses, each corresponding with the respective bone from which it takes its name: maxillary, ethmoid, sphenoid, and frontal. Sinuses also exist in the dura of the brain, which includes the superior sagittal, straight, and the sigmoid, among others.
Which structure opens in sinus venarum?
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.
What is aortic sinus?
An aortic sinus, also called the sinuses of Valsalva is one of the anatomic dilatations of the ascending aorta, which occurs just above the aortic valve. These widenings are between the wall of the aorta and each of the three cusps of the aortic valve.
What happens to left sinus horn?
Conversely, the left vein counterparts are obliterated and the left sinus horn diminishes in size and forms the coronary sinus and the oblique vein of the left ventricle.
What is the function of the conus arteriosus?
The conus arteriosus is muscular and contains a spiral valve. Again, as in lungfishes, this has an important role in directing blood into the correct arterial arches.
What is called sinus?
A sinus is a sac or cavity in any organ or tissue, or an abnormal cavity or passage caused by the destruction of tissue. In common usage, “sinus” usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to it.
What are the sinuses of the heart?
The coronary sinus is a collection of smaller veins that merge together to form the sinus (or large vessel), which is located along the heart’s posterior (rear) surface between the left ventricle and left atrium. The coronary sinus collects the majority of the cardiac venous blood.
Why right atrium is important?
Right atrium: one of the four chambers of the heart. The right atrium receives blood low in oxygen from the body and then empties the blood into the right ventricle.
What is the redirected sinus venarum cavarum?
(redirected from sinus venarum cavarum) [TA] the portion of the cavity of the right atrium of the heart that receives the blood from the venae cavae; it is separated from the rest of the atrium by the crista terminalis.
What is the meaning of sinus venarum?
Sinus venarum forms the smooth posterior wall of the right atrium. It is derived embryologically from the right horn of the sinus venosus. The left horn becomes the coronary sinus. Add a note to the entry “venarum”. Write a usage hint or an example and help to improve our dictionary.
What is the sinus of the vena cava?
sinus of the vena cava. (redirected from sinus venarum cavarum) [TA] the portion of the cavity of the right atrium of the heart that receives the blood from the venae cavae; it is separated from the rest of the atrium by the crista terminalis.
What is the sinus venosus?
The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In humans, it exists distinctly only in the embryonic heart, where it is found between the two venae cavae.