Transversus Nuchae

Its exact function is not firmly established. Based on its attachments it likely helps tense and move the superficial tissues of the posterior neck, and it may assist the auricularis posterior in retracting the ear. When continuous with the platysma it may also help transmit tension through the superficial musculoaponeurotic system.

External occipital protuberance and/or the adjacent superior nuchal line of the occipital bone. It may lie superficial or deep to the trapezius.

Variable. Commonly inserts near the mastoid process or blends with the auricularis posterior. It may also join the posterior border of the sternocleidomastoid, or curve around the mastoid region to continue into the uppermost fibers of the platysma. In one large cadaveric study 43% inserted around the mastoid process and 58% continued toward the platysma.

Variable and incompletely defined. Motor supply is associated primarily with branches of the facial nerve (CN VII), particularly the posterior auricular branch. Communications with the great auricular nerve have also been documented.