Where are pectinate muscles located?

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Study for the Cardiovascular System Exam on heart anatomy, function, and circulatory pathways. Utilize flashcards, multiple-choice questions, and comprehensive explanations to boost your preparation. Ace your exam!

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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