Lab 22 - Image 1
Superficial muscles of the face are shown in a fresh tissue specimen. The superficial muscles move skin and ears, eyelids, nose, and lips to produce facial expression. The platysma m. (1) runs from the neck to the commissure of the lips. It retracts the lips to expose teeth; parts of the muscle are missing (asterisks). Superficial muscles that move the ear may be grouped into rostral (2), lateral (3), and caudal auricular muscles. An orbicularis oculi m. (4) closes the palpebral fissure. A levator nasolabialis m. (5) retracts the nose and upper lip. An orbicularis oris m. is situated within the lips (6).
Superficial muscles are innervated by branches of the facial n. (7). Branches of the trigeminal n. (8) are sensory to skin.