Where are pectinate muscles located?

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Multiple Choice

Where are pectinate muscles located?

Explanation:
Pectinate muscles are comb-like ridges of atrial muscle that line the atrial chambers, increasing the surface area for contraction. They are most prominent on the inner wall of the right atrium and in its appendage (auricle). They are not found in the ventricular walls, the interventricular septum, or the aortic arch. Therefore, their location is the internal wall and auricle of the right atrium.

Pectinate muscles are comb-like ridges of atrial muscle that line the atrial chambers, increasing the surface area for contraction. They are most prominent on the inner wall of the right atrium and in its appendage (auricle). They are not found in the ventricular walls, the interventricular septum, or the aortic arch. Therefore, their location is the internal wall and auricle of the right atrium.

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