TMJ in Dentistry for Resident and dentistry student.pptx

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1. Pebrian Diki Prestya Anatomy of Temporo-mandibular joint

2. Introduction

3. Osseous, Muscle and Joint

4. Mandibular Condylar

5. Articular eminence Then strong bony prominence on the base of the zygomatic process Articular tubercle The lateral part of the articular eminence is reffered to as the articular tubercle and provide attachment for the capsule and lateral temporo-mandibular ligament Glenoid fossa The depression into which the condyle is located Superior to this thin plate bone is the middle cranial fossa Post glenoid tubercle An inferior extension of the squamous portion of the temporal bone, makes the posterior aspect of the glenoid fossa, provide attachment for the capsule and retrodiscal pad

6. Muscle

7. Muscle Lateral View

8. MASSETER Origin Insertion Main Actions Inferior border of the anterior 2/3 of the zygomatic arch Maxillary process of the zygomatic bone Angle of mandible Inferior and lateral parts of the mandibular ramus Elevates mandible Protrudes mandible (superficial head) Aids in lateral excursion of the mandible     Superior and lateral mandibular ramus Coronoid process TEMPORALIS Entire temporal fossa: along the inferior temporal line including the temporal fascia Coronoid process: along the apex, anterior and posterior borders, medial surface extending inferiorly on the anterior border of the mandibular ramus (temporal crest) to the 3 rd molar tooth Elevates mandible Retrudes mandible (posterior fibers) Aids in lateral excursion of the mandible

9. MEDIAL PTERYGOID Deep head Medial surface of lateral pterygoid plate Medial surface of ramus and angle of the mandible (pterygoid tubercles) Elevates mandible Protrude mandible Lateral excursion of the mandible (side-to-side movements)(Actuating unilaterally, it causes the mandible to deviate to the contralateral side, rotating around axis created by contralateral condyle, which is important in grinding on ipsilateral side) Medial pterygoid branch from the mandibular division of the trigeminal nerve (main trunk before it divides into anterior and posterior divisions) The deepest muscle of mastication Forms the pterygomasseteric sling with the masseter If anesthetic is injected into the medial pterygoid m, during an inferior alveolar nerve block, trismus will result Superficial head Maxillary tuberosity Pyramidal process of the palatine

10. LATERAL PTERYGOID Infratemporal crest of the greater wing of the sphenoid Anterior and medial portions of the articular disc Capsule of the temporomandibular joint Pterygoid fovea (upper portion) -Protrudes mandible -Depresses mandible (as result of protrusion) -Lateral excursion of the mandible (Side-to-side movements)(Acting unilaterally, it causes the mandible to deviate to the contralateral side, rotating around axis created by contralateral condyle, which is important in grinding on ipsilateral side) Lateral pterygoid branches (for each head) from the anterior division of the mandibular division of the trigeminal nerve which exits the foramen ovale, lying medial to the lateral pterygoid (often this innervation is observed to be a branch from the buccal branch of the trigeminal nerve) Maxillary a. runs either superficial or deep to it Surrounded by the pterygoid venous plexus Buccal branch of the trigeminal nerve passes between the 2 heads. Lateral surface of the lateral pterygoid plate Pterygoid fovea on the neck of the condyle of the mandible

11. Ligament

12. TERIMA KASIH