The posterior auricular muscle is a muscle behind the auricle of the outer ear. It arises from the mastoid part of the temporal bone, and inserts into the lower part of the cranial surface of the auricle of the outer ear. It draws the auricle backwards, usually a very slight effect.

The posterior auricular muscle is found behind the auricle of the outer ear.^[1] It consists of two or three fleshy fasciculi. These arise from the mastoid part of the temporal bone by short aponeurotic fibers.^[1] They insert into the lower part of the cranial surface of the auricle of the outer ear.^[1]

The posterior auricular muscle is supplied by branches of the posterior auricular artery, which continues deep to the muscle.^[2] It is drained by the posterior auricular vein that accompanies the artery.^[2]

The posterior auricular nerve draws the auricle of the outer ear backwards.^[2] This effect is usually very slight, although some people can wiggle their ears due to a more significant muscle movement.^[2]

If the posterior auricular muscle inserts into an unusual part of the auricle of the outer ear, this can cause protruding ears.^[1] In one study, the muscle was found to be absent in 5% of people.^[9]

• Anterior auricular muscle
• Superior auricular muscle