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TMJ - Ch.13
Temporomandibular Jt.
| Question | Answer |
|---|---|
| Describe Depression - Action of TMJ | Opening mouth (sagittal plane) |
| Describe Protrusion - Action of TMJ | Pushing bottom teeth forward past upper teeth |
| Describe Retrusion - Action of TMJ | Pulling bottom teeth backward behind upper teeth |
| Describe Lateral movement - Action of TMJ | Mandible moves to the right or left |
| Describe Elevation - Action of TMJ | Closing mouth (sagittal plane) |
| Describe the joint actions for depression | Anterior rotation of condyle & sliding of disc & condyle anterior and inferior |
| Describe the joint actions for elevation | Posterior rotation of condyle & sliding of disc & condyle posterior and superior |
| Describe the joint actions for protrusion | Sliding forward - no rotation occurs |
| Describe the joint actions for retrusion | Sliding backward - no rotation occurs |
| Describe the joint actions for lateral movement | Same side spins & opposite side rotates |
| Name the action for the Temporalis muscle | Bilateral: Elevation & retrusion / Unilateral: Lateral deviation to the same side |
| Name the nerve for the Temporalis muscle | Trigeminal nerve (Cranial nerve V) |
| Name the action for the Masseter muscle | Bilateral: Elevation / Unilateral: Lateral deviation to the same side |
| Name the nerve for the Masseter muscle | Trigeminal nerve (Cranial nerve V) |
| Name the action for the Medial Pterygoid muscle | Bilateral: Elevation & protrusion / Unilateral: Lateral deviation to the opposite side |
| Name the nerve for the Medial Pterygoid muscle | Trigeminal nerve (Cranial nerve V) |
| Name the action for the Lateral Pterygoid muscle | Bilateral: Depression & protrusion / Unilateral: Lateral deviation to the opposite side |
| Name the nerve for the Lateral Pterygoid muscle | Trigeminal nerve (Cranial nerve V) |
| What is the nerve for the muscles of mastification? | Trigeminal nerve (Cranial nerve V) |
| Name the muscles of mastification who's action is elevation | Temporalis, masseter, & medial pterygoid |
| Name the muscles of mastification who's action is retraction (retrusion) | Temporalis |
| Name the muscles of mastification who's action is depression | Lateral pterygoid |
| Name the muscles of mastification who's action is protrusion | Medial & lateral pterygoid |
| Name the muscles of mastification who's action is lateral deviation to the left | Left temporalis & masseter and right medial & lateral pterygoid |
| Name the muscles of mastification who's action is lateral deviation to the right | Right temporalis & masseter and left medial & lateral pterygoid |