Muscles of Masstication Flashcards
Masseter Origin
Origin- Zygomatic arch and maxillary process of zygomatic bone
Masseter Insertion
Lateral surface of ramus of mandible
Masseter Innervation
CN V Trigeminal V3
Masseter Function
Elevate mandible and same side deviation
One of strongest muscles in world
Temporalis Origin
Bone of temporal fossa and temporal fascia
Temporalis Insertion
Coronoid process of mandible
Ramus of mandible
Temporalis Innervation
CN V trigeminal V3
Temporalis Function
Elevate and retract mandible
Medial pterygoid Origin
Deep- Lateral plate pterygoid process
Superficial- maxilla
Medial Pterygoid Insertion
Medial surface of mandible near angle
Innervation of all muscles of mastication
CN V, Trigeminal V3
Function of Medial pterygoid
Elevation and side to side movements of mandible
Origin of lateral pterygoid
Upper head- root of infratemporal fossa
Lower head- Lateral plate of pterygoid process
Insertion of lateral pterygoid
Capsule of TMJ in region attachment to articular disk and pterygoid fovea on neck of mandible
Function of lateral pterygoid
Protrusion and side to side movement of mandible
Depression of mandible
Hyoids
Helps to open TMJ
3 parts of Trigeminal nerve
V1- eye
V2- maxillary part
V3- mandible
vascular supply of TMJ
superficial termporal artery
maxillary artery
(both from external carotid)
Chewing
Mouth opens, mouth closes
Tongue and cheeks help move apple left or right
In a figure 8 motion
Elevation of mandible is done by
temporalis, masseter, and medial pterygoid
Depression of mandible done by
gravity, hyoids and lateral pterygoid (maybe?)
Protrusion of mandible done by
lateral pterygoid muscle, with some assistance by the medial pterygoid;
Retraction of mandible
temporalis and masseter muscles
Side to side movement of mandible done by
medial and lateral pterygoid muscles
