How is the transverse pericardial sinus formed?
The ventral surface of the transverse sinus is formed by the posterior aspect of the ascending aorta and the inferior–posterior surface of the right and left pulmonary arteries before they emerge from the pericardial sac.
What is a transverse pericardial sinus?
The transverse pericardial sinus is the transverse communication between the left and right parts of the pericardial space proper behind the two outflow arteries of the heart.
Do humans have a pericardial sac?
Your heart is surrounded by a double-layered membrane, called the pericardium or pericardial sac. There is a very small amount of fluid called pericardial fluid in the pericardial sac. This fluid helps to decrease friction between the pericardial layers. It also allows for smooth movement of the heart when it beats.
What forms the oblique pericardial sinus?
The oblique sinus is a cul-de-sac extending superiorly from the inferior vena cava between the two left pulmonary veins on one side and the two right pulmonary veins on the other. Its anterior wall is formed by the posterior wall of the left atrium, between the four pulmonary veins.
What is sinus venosus in humans?
The sinus venosus is a cardiac chamber upstream of the right atrium that harbours the dominant cardiac pacemaker. During human heart development, the sinus venosus becomes incorporated into the right atrium.
What is transverse sinus?
The transverse sinuses (left and right lateral sinuses), within the human head, are two areas beneath the brain which allow blood to drain from the back of the head. They run laterally in a groove along the interior surface of the occipital bone.
What is meant by pericardial sinus?
The pericardial sinuses are impressions in the pericardial sac formed between the points where great vessels enter it. Pericardial sinus. Posterior wall of the pericardial sac, showing the lines of reflection of the serous pericardium on the great vessels. ( Transverse sinus labeled at center.
What is the name of the sac that the heart sits in?
The pericardium is a thin, two-layered, fluid-filled sac that covers the outer surface of the heart. It provides lubrication for the heart, shields the heart from infection and malignancy, and contains the heart in the chest wall.
What does the sinus venosus develop into?
The sinus venosus also forms the sinoatrial node and the coronary sinus; in (most) mammals only. 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 the sinus venosus function?
The sinus venosus collects venous blood (from the large bilateral ducti Cuvier, hepatic veins, anterior jugular veins, and the secondary circulation) and delivers it to the atrium.
What is pericardial sinus?
From Wikipedia, the free encyclopedia. The pericardial sinuses are impressions in the pericardial sac formed between the points where great vessels enter it. Pericardial sinus. Posterior wall of the pericardial sac, showing the lines of reflection of the serous pericardium on the great vessels. (