5-2 articulation muscles II Flashcards
muscles of the face
divided based on orientation of muscle fibers
orbicularis oris
transverse facial muscles
angular muscles - fibers run at an angle (mouth & up)
vertical facial muscles (vertical fibers)
all facial muscles are innervated by CN VII
orbicularis oris
principle muscle acting upon the lips
origin & insertion = modiolus
closes the mouth & puckers the lips
modiolus
corner of the mouth
8 muscles insert here
transverse muscles of the face
buccinator - deep
risorius - superficial
pull the lips against the teeth
compress the lips
retract corners of the lips
buccinator
origin - pterygomandibular ligament (between sphenoid & mandible)
insertion - orbicularis oris
pulls the lips against the teeth
compress lips
important muscle for chewing
risorius
on top of the buccinator
origin - fascia of the masseter (surface)
insertion - modiolus
primarily retracts the corners of the mouth
smile muscle
angular muscles
labial elevators - elevate upper lip
labial depressors
levator labii superioris
origin -lower margin of the orbit of the maxillae
insertion - upper lip
elevates upper lip
levator labii superioris alaeque nasi
origin - frontal & orbital process of maxillae
insertion - lateral part of nostril & upper lip
elevate upper lip & flare nostril
Elvis Presley muscle
zygomatic minor
origin - facial process of zygomatic bone
insertion - upper portion of orbicularis orbit
elevate upper lip
zygomatic major
origin - facial process of zygomatic bone
insertion - modiolus
draw corner of mouth up & back
inferior to zygomatic minor
depressor labii inferioris
origin - oblique line of mandible
insertion - lower lip (orbicularis oris)
draw lower lip downward
vertical muscles
mentalis
depressor anguli oris
levator anguli oris
compress the lips & assist in elevating & lowering them
mentalis
origin - mandible
insertion - skin of the chin
elevates & wrinkles the chin, pulls lower lip out (pouting)
depressor anguli oris
origin - mandible
insertion - modiolus
depresses the corner of the mouth (frowning)
assists in lowering lips
compresses lips w/ other vertical muscles
levator anguli oris
origin - maxilla
insertion - modiolus
elevates the corners of the mouth
epicranial aponeurosis
sheet of tendon like material
covers upper part of cranium
attached behind occipital protuberance & forms a short & narrow prolongation between its union w/ the frontalis
platysma
origin - broad fascia covering the pectoralis major & deltoid muscles
insertion - mandible
draws lower lip & corner of mouth down, opening the mouth
epicranius
broad layer covering the whole of one side of the vertex of the skull
occipital bone –> eyebrow
occipitalis & frontalis
frontalis
frontal belly
raises the eyebrows
draws scalp forward
expression of surprise
occipitales
occipital belly
draws the scalp backwards
expression of surprise
orbicularis oculi
origin - nasal part of frontal bone & frontal process of maxilla
form the eyelids
only muscles that closes the eyes
corrugator supercilii
deep to the frontalis
origin - nasal bridge
insertion - skin of forehead
draws eyebrows down & medially
frowning muscle
smiling muscles
orbicularis oculi
zygomatic major & minor
levator labii superioris
levator anguli oris
risorius
intrinsic tongue muscles
origin & insertion inside the tongue
change the shape of the tongue
innervated by CNXII
superior longitudinal
located just beneath mucous membrane of tongue
origin - base of tongue near epiglottis
insertion - tip & sides of tongue
shortens tongue & turns tip upward
inferior longitudinal
undersurface of tongue
origin - root
inserion - tip
shortens the tongue & pulls tip down
transverse muscle of the tongue
origin - median septum
insertion - lateral margins of the tongue
narrows & elongates the tongue
vertical
origin - base
insertion - mucous membrane
no fibers on tongue midline
flattens the tongue
extrinsic tongue muscles
origin - adjacent structure
insertion - tongue
changes shape & position of tongue
genioglossus
origin: internal surface of mandible
insertion: tongue
contraction produces a range of tongue movements
styloglossus
origin: styloid process of temporal bone
insertion: sides of the tongue
draws sides of tongue up & back
hyoglossus
origin: hyoid bone
insertion: posterior sides of tongue
retracts & depresses the tongue
palatoglossus
origin: posterior surface of hard palate
insertion: sides of tongue
raise & retract sides & back of tongue
lowers soft palate if tongue is fixed
CNX
