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Atria of the Heart

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Ridges in anterior wall of right atrium are called?

Pectinate muscles


What muscle is found in the right atrium?

The type of muscle that is found in the right atrium is mainly the pectinate muscles. This is one of the four chambers of the heart.


Where is Trabeculae carneae found?

Trabeculae carneae are fleshy beams found on the inner surface of the right and left ventricles of the heart. Do not confuse it with the pectinate muscle that is found in the right atrium and left auricle.


Differentiate clearly between the location and appearance of pectinate muscle and trabeculae carnea?

In terms of location, the pectinate muscle can be found in the atrium, while the trabeculae carnea can be found in the ventricles. Also notice the trabeculae carnae should be thicker in the left ventricle as it is pumping blood into the systemic circuit (which has more surface area than the pulmonary circuit).


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What are the Ridges in anterior wall of the right atrium called?

The ridges in the anterior wall of the right atrium are called pectinate muscles or pectinate ridges. These muscular ridges are important for increasing the surface area of the atrium to allow for more efficient contraction and blood flow.


What is the difference between Hilton white line and the pectinate line?

Hilton's white line is slightly below the pectinate line. The transition of epithelium at Hilton's white is from non-keratinising squamous to keratining squamous while at the pectinate line it is coloumnar to non-keratinising stratified squamous. Also Hilton's seperates the venous drainage from potal to systemic while pectinate line seperates arterial supply from inf. mesenteric to internal pudendal. Second year med student


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