MUSCLES of MASTICATION Flashcards
LATERAL PTERYGOID
origin & innervation?
O: SUPERIOR- Greater wing of Sphenoid
INFERIOR- Lateral surface of LATERAL PTERYGOID
PLATE (of sphenoid)
N: trigeminal nerve (CN V)
MEDIAL PTERYGOID
ORIGIN
& INNERVATION?
O: MEDIAL surface of LATERAL PTERYGOID PLATE (of
the sphenoid bone), PALATINE, PTERYGOID FOSSA
N: TRIGEMINAL (CN V)
MEDIAL PTERYGOID
INSERTION ?
I: INNER SURFACE Ramus & Angle MANDIBLE
MEDIAL PTERYGOID
ACTION?
A: IPSILATERAL DEVIATION, PROTRACTION
ELEVATION of mandible (closes jaw)
LATERAL PTERYGOID
Insertion?
I: SUPERIOR-Joint Capsule & Articular Disk of TMJ
INFERIOR- NECK of mandibular condyle
LATERAL PTERYGOID
Action?
A: CONTRALATERAL deviation; opens jaw
(DEPRESSION & PROTRACTION of mandible)
TEMPORALIS (deep)
Origin & Innervation?
O: Temporal Fossa (temporal, sphenoid, frontal
lateral aspect)
N: TRIGEMINAL (CN V) mandibular branch
TEMPORALIS
Insertion?
I: CORONOID PROCESS & RAMUS of mandible
TEMPORALIS
Action?
A: RETRACTION & ELEVATION of MANDIBLE (closes jaw)
MASSETER
ORIGIN & INNERVATION?
O: SUPERFICIAL- INFERIOR BORDER of Zygomatic Arch
& Zygomatic Process of MAXILLA
DEEP (PROFUNDUS)- POSTERIOR 1/3 INF. BORDER & MEDIAL
SURFACE of Zygomatic Arch
MASSETER
INSERTION?
I: SUPERFICIAL- Angle & Ramus of Mandible
DEEP- SUPERIOR 1/2 Ramus & CORONOID PROCESS
of mandible
MASSETER
ACTION?
A: ELEVATION of mandible (clenches teeth)
PROTRACTION & RETRACTION
One of the STRONGEST MUSCLES in human body!
