General Muscle Origins, insertions, & Actions

27 terms by zglyons 

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Anterior Cranial Aponeurosis

Epicranius: frontalis origin

Skin of eyebrows and root of nose

Epicranius: frontalis insertion

Raises eyebrows and wrinkles forehead skin horizontally

Epicranius: frontalis action

Occipital and temporal bones

Epicranius: occipitalis origin

Posterior Cranial Aponeurosis

Epicranius: occipitalis insertion

Fixes aponeurosis and pulls scalp posteriorly

Epicranius: occipitalis action

Frontal and maxillary bones and ligaments around orbit

Orbicularis oculi origin

Skin around the eye; circles the orbit

Orbicularis oculi insertion

Closes the eye , squints the eye, and draws eyebrows inferiorly

Orbicularis oculi action

Arises indirectly from maxilla and mandible

Orbicularis oris origin

Encircles mouth; inserts into muscle and skin at edges of mouth

Orbicularis oris insertion

Closes and protrudes lips (kissing and whistling action)

Orbicularis oris action

Zygomatic bone

Zygomaticus origin

skin and muscle at corner of mouth

Zygomaticus insertion

Raises lateral corners of mouth upward (smiling action)

Zygomaticus action

Fascia of upper chest (over pectoral muscles and deltoid)

Platysma origin

Lower margin of mandible, and skin and muscle at corner of mouth

Platysma insertion

Helps depress mandible; pulls lower lip down; tenses skin of neck (e.g., during shaving)

Platysma action

Temporal Fossa

Temporalis Origin

Coronoid process of mandible

Temporalis insertion

Maintains position of mandible at rest; helps close jaw (minor); retracts mandible

Temporalis action

Zygomatic arch and maxilla

Masseter origin

Angle and ramus of mandible

Masseter insertion

Prime mover of jaw closure; elevates mandible

Masseter action

Manubrium and medial portion of clavicle

Sternocleidomastoid origin

Mastoid process of temporal bone and superior nuchal line of occipital bone

Sternocleidomastoid insertion

Prime mover of active head flexion; rotates head laterally

Sternocleidomastoid action

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