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5 Cards in this Set

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masseter
O=zygomatic arch
I=angle & ramus of mandible
A=prime mover of jaw closure; elevates mandible
N=CN V-trigeminal
elevates...
temporalis
O=temporalis fossa
I=coronoid process of mandible via a tendon that passes beneath zygomatic arch
A=closes jaw; retraction; lateral & medial excursion
N=CN V-trigeminal
closes...
buccinator
O=molar region of maxilla & mandible
I=orbicularis oris at angles of mouth
A=draws corner of mouth laterally; compresses cheek (e.g. whistling, blowing, sucking); well developed in nursing infants
N=CN VII-fascial
nursing infants use it
medial pterygoid
O=medial surface of sphenoid, maxilla, palatine bone
I=medial surface of mandible near angle
A=synergist of temporalis & masseter in elevation of the mandible; acts with lateral pterygoid to promote side-to-side movements
N=CN V-trigeminal
syngergist of temporalis & masseter
lateral pterygoid
O=greater wing of lateral pterygoid plate of sphenoid
I=condyle of mandible & capsule of TMJ
A=protrudes mandible; grinding movements of lower teeth
N=CN V-trigeminal
protrudes...& action that can cause TMJ