muscles of head and neck

study showing term + answering w/def

A; covers forehead

epicranius (frontal and occipital bellies)

epicranius attachments

bony: apicranial aponeurosis; soft tissue: skin of forehead

epicranius action

elevate eyebrow + wrinkles forehead

B; surrounds orbit

orbicularis oculi

orbicularis oculi attachments

bony: skin around the orbit; soft tissue: skin around the eyelids

orbicularis oculi action

closes eyelids; blinking/squinting of eye

C; extends diagonally from cheek to mouth

zygomaticus (major, minor)

zygomaticus (major, minor) attachments

bony: zygomatic bone; soft tissue: skin around mouth

zygomaticus (major, minor) action

pulls corners of mouth posteriorly and superiorly (smile)

D; surrounds mouth

orbicularis oris

orbicularis oris attachments

bony: maxilla and mandible; soft tissue: skin around lips

orbicularis oris action

purses and protrudes lips; puckering

E; superficial neck muscle

platysma

platysma attachments

bony: fascia of upper thorax and lower neck; soft tissue: mandible

platysma action

depresses lower lip, tenses skin of neck; depresses the mandible

F; covers temporal bone

temporalis

temporalis attachment

superior: temporal bone; inferior: coronoid process of mandible

temporalis action

elevates and retracts mandible

G; covers lateral portion of “jaw”

masseter

masseter attachments

superior: zygomatic arch; inferior: coronoid process of mandible

masseter action

elevates and protracts mandible

runs diagonally across neck from sternum and clavicle to temporal bone; deep to platysma

sternocleidomastoid

sternocleidomastoid attachments

superior: mastoid process of temporal bone; inferior: sternum and clavicle

sternocleidomastoid action

alone: laterally rotates neck to opposite side; together: flexes neck