muscles of mastication 2 Flashcards
name the muscles of mastication
- masseter
- temporalis
- lateral pterygoid (superior and lateral heads)
- medial pterygoid (superficial and deep heads)
action of muscles of mastication
movement at TMJ
what innverates the muscles of mastication
trigeminal nerve - mandibular division (V3)
what foramen in the cranium does the mandibular division pass through
foramen ovale
location of infratemporal fossa
- irregular shaped space
- inferior to zygomatic arch
- deep to ramus of mandible
- posterior to maxilla
osteology associated with the mandible
- coronoid process
- condyloid process (head and neck)
- ramus of mandible
- angle of mandible
- body of mandible
- tuberosity of maxilla
associated osteology on inferior view
- zygomatic arch
- temporal fossa
- greater wing of sphenoid (infratemporal surface)
- tuberosity of maxilla
- lateral pterygoid plate (Sphenoid bone)
origin and insertion of masseter muscle
origin –> zygomatic bone, zygomatic arch
insertion –> ramus of mandible (angle and lateral surface)
action of masseter
elevate and protrude mandible
origin and insertion of temporalis
origin –> temporal fossa
insertion –> coronoid process of mandible (apex and medial surface)
action of temporalis
elevate and retract mandible
origin and insertion of superior head of lateral pterygoid muscle
origin –> greater wing of sphenoid bone
insertion –> region of temporomandibular joint, neck of condyloid process of mandible
origin and insertion of inferior head of lateral pterygoid muscle
origin –> lateral surface of lateral pterygoid plate
insertion –> region of temporomandibular joint, neck of condyloid process of mandible
action of the heads of the lateral pterygoid muscle
acting together –> protrude mandible
acting alone and alternatively –> side to side movement
origin and insertion of the heads of the medial pterygoid muscle
deep head:
origin –> medial surface of lateral pterygoid plate
insertion –> medial surface of mandible
superficial head:
origin –> tuberosity of maxilla
insertion –> medial surface of mandible
action of heads of medial pterygoid muscle
acting together –> elevate and protrude mandible
acting alone and alternatively –> produce a grinding motion
