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IOAN
Muscles of TMJ
| Muscles | Origin | Insertion | Action | Innervations |
|---|---|---|---|---|
| Masseter | zygomatic arch of temporal bone and zygomatic process of maxilla | andgle of the Ramus and coronoid process of mandible | bilaterally: TMJ elevation Unilaterally: ipsilateral lateral deviation of TMJ | trigeminal nerve (cranial nerve V) |
| Temporalis | Temporal fossa | Coronoid process and ramus of Mandible | Bilaterally: TMJ Elevation and Retrusion (posterior fibers) unilaterally: ipsilateral lateral deviation of TMJ | Trigeminal Nerve (cranial nerve V) |
| Lateral Pterygoid | Lateral Pterygoid plate and greater wing of the sphenoid | mandibular condyle and articular disk | Bilaterally: TMJ depressions and protrusion. unilaterally: contralateral lateral deviation of TMJ | Trigeminal Nerve (cranial nerve V) |
| Medial Pterygoid | Lateral pterygoid plate of the Sphenoid bone and Tuberosity of the Maxilla | Ramus and angle of the mandible | bilaterally: TMJ elevation and Protrusion Unilaterally contralateral lateral deviation of the TMJ | Trigeminal Nerve (cranial nerve V) |