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Muscles of the Head and Neck Origin: stationary point of attachment Insertion: movable point of attachment Action: Anatomical movement that results from the contraction of the muscle Most muscles originate on the surface of the skull and insert into the dermis Create facial movements and expressions Action: raises eyebrow, wrinkles forehead Action: tenses and retracts the scalp Action: closes mandible Ex: closes mouth during chewing Action: elevates mandible Ex: clenching your jaw, crushing food Action: closes eye Ex: blinking, squinting Action: compresses nostril Action: draws corner of mouth upward Ex: smiling Action: compresses cheeks Ex: playing a trumpet, whistling Action: compresses, purses lips Ex: kissing Action: depresses corner of mouth Ex: frowning frontalis temporalis Orbicularis oculi zygomaticus Orbicularis oris masseter buccinator Depressor anguli platysma sternocleidomastoid Epicranial aponeurosis frontalis occipitalis temporalis Orbicularis oculi nasalis zygomaticus masseter sternoclediomastoid buccinator Orbicularis oris platysma Involved in Swallowing and chewing Moving your head and neck Supporting your head Anterior neck muscles work on the hyoid bone Suprahyoid muscles (above the hyoid) pull hyoid up Infrahyoid muscles (below the hyoid) pull hyoid down Extends from the clavicles and the sternum to the mastoid region of the skull Actions: flexion of head, lateral flexion, rotation of head side to side Action: tenses skin of neck, depresses mandible (opens mouth) Action: elevates hyoid bone when swallowing; depresses the mandible (opening mouth) Broad/flat muscle provides muscular floor to the mouth and helps press tongue to top of mouth Connects the hyoid bone to the sternum Action: depresses hyoid bone and larynx Anchors the larynx to the sternum Action: depresses hyoid bone and larynx Connects the hyoid bone to the styloid process of the skull Action: elevates hyoid digastric mylohyoid stylohyoid thyrohyoid omohyoid sternohyoid sternothyroid Sternomastoid Cleidomastoid Sternohyoid Mylohyoid Digastric Masseter TOO DEEP TO DISSECT Stylohyoid Sternothyroid Thyrohyoid Digastric Mylohyoid Masseter Sternohyoid sternomastoid cleidomastoid Frontalis Buccinator and orbicularis oris Orbicularis oculi Platysma Orbicularis oris Depressor Anguli Oris