SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Right atrial appendage of the heart (centre), coloured scanning electron micrograph (SEM). This view is of the external surface of the heart, showing this structure protruding from the surface of the right atrium. It is a small, conical muscular pouch, similar to the corresponding structure on the left atrium. The atrial appendages function as reservoirs of blood.
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