OIAs of Musculature of the head Flashcards
Buccinator
ORIGIN : alveolar process of mandible and maxilla
INSERTION : angle of mouth
ACTION : compress cheek against molars
Depressor anguli oris
ORIGIN : anteriolateral surface of mandibular body
INSERTION : angle of mouth
ACTION : depresses angle of mouth
Frontalis
ORIGIN : galea aponeurotica
INSERTION : skin and muscles of forehead
ACTION : raises eyebrows/wrinkles skin of forehead
Occipitalis
ORIGIN : superior nuchal line of the occipital bone
INSERTION : galea aponeurotica
ACTION : tenses scalp, moves outer ear
Orbicularis Oculi
ORIGIN : medial margin of bony orbit
INSERTION : eyelids
ACTION : closes eyelids
Orbicularis Oris
ORIGIN : maxilla and mandible
INSERTION : skin surrounding mouth
ACTION : closes and purses lips
Zygomaticus major
ORIGIN : zygomatic bone
INSERTION : angle of mouth
ACTION : raise angle of mouth
Temporalis
ORIGIN : temporal fossa
INSERTION : coronoid process of mandible
ACTION : closes jaw (elevates mandible)
Masseter
ORIGIN : zygomatic arch
INSERTION : mandibular angle and ramus
ACTION : closes (elevates) and retracts mandible
Platysma
ORIGIN : skin of lower neck and upper thorax
INSERTION : lower mandible and skin of the lower face
ACTION : tenses skin of neck, depresses mandible
Risorius
ORIGIN : fascia associated with masseter
INSERTION : angle of mouth
ACTION : draws angle of mouth to side
Superior rectus
ACTION : elevates eyes
Inferior rectus
ACTION : depresses eyes
Lateral rectus
ACTION : moves eye laterally
Medial rectus
ACTION : moves eye medially
