muscle - facial expression

• origin: epicranial aponeurosis 
• insertion: skin of eyebrows and root of nose 
• action: with aponeurosis fixed raises the eyebrows (in surprise). Wrinkles forehead skin horizontally.

• origin: occipital and temporal bones 
• insertion: epicranial aponeurosis 
• action: fixes aponeurosis and pulls scalp posteriorly

origin: arises indirectly from maxilla and mandible; fibers blend with fibers of other facial muscle associated with the lips

insertion: encircles mouth; inserts into muscle and skin at angles of mouth

action: closes lips; purses and protrudes the lips; kissing and whistling muscle

Origin: zygomatic bone

Insertion: skin and muscle at corner of mouth 

Action: raises lateral corners of mouth upward (smiling)

Origin: molar region of maxilla 

Insertion: orbicularis oris 

action: compresses check (whistling and sucking); trampoline-like action holds food between teeth during chewing; draws corners of mouth laterally; well developed in nursing infants

origin: fascia of chest (over pectoral muscles and deltoid) 

insertion: lower margin of mandible, and skin of muscle at corner of mouth 

action: tenses skin of neck (during shaving); helps depress mandible; pulls lower lip back and down, producing downward sag of mouth

origin: frontal and maxillary bones and ligaments around orbit 

insertion: tissue of eyelid

action: closes eye; various parts can be activated individually; produces blinking and squinting; draws eyebrows inferiorly