A&P - Muscle Group 1

Muscles of the head and neck

Frontalis (frontal belly)

With aponeurosis fixed, raises the eyebrows

Occipitalis (occipital belly)

Fixes epicranial aponeurosis and pulls scalp posteriorly

Corrugator Supercilli

Draws eyebrows together and inferiorly

Orbicularis Oculi

Closes eye ; Blinking, squinting, winking

Mentalis

Wrinkles chin (ugly cry)

Buccinator

Compresses cheek (whistling, sucking, nursing)

Masseter

Prime mover of jaw closure ; elevates mandible

Temporalis

Closes jaw ; maintains position of mandible at rest

Sternocleidomastoid

Flexes & laterally rotates the head

Zygomaticus (major & minor)

Raises lateral corners of mouth upward (smiling muscle)

Risorius

Draws corner of lip laterally (laughing)

Levator Labii Superioris

Opens lips (Elvis muscle)

Depressor Labii Inferioris

Draws lower lip inferiorly (pout)

Orbicularis Oris

Closes lips (kissing and whistling)

Depressor Anguli Oris

Draws corners of mouth down and laterally (tragedy mask grimace)