Anatomy
 |
 |
 |
 |
| Muscle |
Origin | Insertion | Action |
| Temporalis | Floor temporal fossa Deep surface temporal fascia |
Coronoid process Anterior border of ramus of mandible |
Elevates mandible |
| Masseter | Inferior border / medial surface of zygomatic arch | Lateral surface of ramus of mandible | Elevates mandible Protrudes mandible |
| Lateral pterygoid | Lateral surface of lateral pterygoid plate |
Neck of mandible |
Depress mandible Protrudes Side to side movement |
| Medial pterygoid | Medial surface of medial pterygoid plate | Medial surface of ramus of mandible | Elevate mandible Protrudes Side to side movement |
Temporo-Mandibular joint
- Hinged synovial joint - permits movement in three planes
- Contains fibrocartilaginous disc and fibrocartilage on the bony surfaces
- Surrounded by fibrous capsule: attaches to margins of articular area ib temporal bone and around neck of mandible
- Thick part of articular capsule forms intrinsic lateral ligament (TM ligament)
- Two extrinsic ligaments connect mandible to cranium (stylomandibular, sphenomandibular)
- Connects condyle of mandible to articular mandibular ("glenoid") fossa of squamous part of temporal bone
Movements
| Movement | Movers |
| Depression |
|
| Elevation |
|
| Side to side |
|
| Protrusion |
|
| Retraction |
|