Pectinate muscles extend from the atrial internal wall into the pouch-like structures that increase the total filling capacity of the atrium.These structure are the

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Auricles are pouch-like structures that increase the total filling capacity of the atrium and pectinate muscles extend from the atrial internal wall into these structures. None of the other options mentioned have these pouch-like structures.

Pectinate Muscles Extend from the Atrial Internal Wall into the Pouch-Like