lecture exam 2 -head, trunk Flashcards
What is the epicranius composed of
occipitofrontalis muscles and epicranial aponeurosis
Function of frontal belly of occipitofrontalis
elevates eyebrows and wrinkles skin of forehead
Function of occipital belly of occipitofrontalis
retracts scalp slightly
Function of orbicularis oculi
closes the eyes (blink, wink)
Function of orbicularis oris
closes and purses lips
Function of zygomaticus major
elevates corner of mouth (smile)
Function of depressor anguli oris
depresses corner of mouth (frown)
Function of Buccinator
pulls cheek against teeth when chewing (some trumpet players stretch this muscle out)
Function of platysma
tenses skin of neck and depresses lower lip (pout)
Define mastication
chewing
Function of the mastication muscles
elevate the mandible
What is the main force that depresses the mandible
gravity
Function of masseter
elevate and protract mandible
Function of temporalis
elevates and retracts mandible
Function of medial pterygoid
elevates and protracts mandible and moves mandible side to side
Function of lateral pterygoid
elevates and protracts mandible and moves mandible side to side
Function of glenioglossus
protrudes tongue
Function of styloglossus
elevates and retracts tongue
Function of hyloglossus
depresses and retracts tongue
Function of sternocleidnmastoid
- each rotates head to one side
- Together they flex the head/neck
What bones does the sternocleidomastoid attach to
sternum, clavicle, mastoid process
Function of splenius capitus
- each rotate head to one side
- together they extend head and neck