MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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R. Atrium
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L. Atrium
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R. Auricle
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L. Auricle
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Detailed explanation-1: -The pectinate muscles are “teeth of a comb” shaped parallel muscular columns that are present on the inner wall of the right and left atria. The right atrium has thick and coarse pectinate muscles while these are few smooth and thinner in the left atrium.
Detailed explanation-2: -The right atrium contains prominent muscular bundles and an extensive array of pectinate muscles.
Detailed explanation-3: -No structure resembling the terminal crest is seen in the left atrium. Instead the left atrial wall is composed of intermingled series of muscles, chief of these being the interatrial band and the septoatrial bundle. The former is arranged circumferentially at the atrial base, while the latter is mainly longitudinal.