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Pectinate muscles make up the part of the wall in front of this, the right atrial appendage. [citation needed] In the left atrium, the pectinate muscles are confined to the inner surface of its atrial appendage. [1] They tend to be fewer and smaller than in the right atrium.
The crista terminalis provides the origin for the pectinate muscles. [citation needed] The sinoatrial node is located in the superior part of the crista terminalis at the junction of the right atrium, and superior vena cava. [2]: 60
The sinus venarum (also known as the sinus of the vena cava, or sinus venarum cavarum [1]) is the portion of the right atrium in the adult human heart [2] where the inner surface [3] of the right atrium is smooth, [2] [3] whereas the rest of the inner surface is rough [3] (trabeculated [2]) due to the presence of pectinate muscles. [4]
Pectinate may refer to: Pectinate line , a line which divides the upper two thirds and lower third of the anal canal Pectinate muscles , parallel ridges in the walls of the atria of the heart
Musculi pectinati of the heart, also known as pectinate muscles; Pectineus muscle, an adductor of the thigh; Pectineal line (femur) Pectineal line (pubis), also known as the pecten pubis; Pectineal ligament, or Cooper's Ligament, located along the pecten pubis
The right atrioventricular orifice (right atrioventricular opening) is the large oval aperture of communication between the right atrium and ventricle in the heart.. Situated at the base of the atrium, it measures about 3.8 to 4 cm. in diameter and is surrounded by a fibrous ring, covered by the lining membrane of the heart; it is considerably larger than the corresponding aperture on the left ...
The blood supply of the AV node is from the atrioventricular nodal branch.The origin of this artery is most commonly (80–90% of hearts) a branch of the right coronary artery, with the remainder originating from the left circumflex artery.
The trabeculae carneae and the papillary muscles make up a significant percentage of the ventricular mass in the heart (12-17% in normal human adult hearts), and are correlated with ventricular end diastolic volume. [5] Trabeculae ratios of capillary-to myocyte differ between the walls of the right and left ventricle.
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