this presentation describes the detail anatomy of Temporo-mandibular joint with respect to its articulating surfaces, ligaments, muscles and blood and nerve supply.
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Anatomy of TMJ
1. TMJ
To MBBS 2nd year
05-03-2017
Dr. Laxman Khanal
Assistant Professor, Department of Anatomy
PBL –Resource session
BPKIHS, Dharan
2. Introduction
• Joint between temporal bone (cranial bone) and
mandible (facial bone) that allows the movements of
the mandible for speech and mastication.
• Major function of TMJ is mastication and speech.
• It produces rotation and sliding type of movements.
• Also called as ginglimoarthroidal joint.
• Structurally it is condylar type of joint.
• Acts like class III lever.
11. Articulating surfaces of TMJ
1. Inferior surface of mandibular fossa & AE
2. Superior surface of articular disc
3. Inferior surface of articular disc
4. Superior surface of condyle of mandible
12.
13. TMJ is Unique !!
• Articular surfaces are covered by fibro
cartilage rather than hyaline cartilage.
• Has four articulating surfaces.
• Two joints cannot be moved independently.
• Movement is not only guided by the shape of
the bones, muscles, and ligaments but also by
the occlusion of the teeth.
17. Articular surfaces
Mandibular components
-Condyle of mandible
Temporal component
- Articular eminence of temporal bone
-Articular fossa of temporal bone
Articular Disc
• Made up of fibro cartilage
Anterior band
Intermediate band (thinnest)
Posterior band
Posterior bilaminar zone (highly vascular and
innervated)
Anterior end- attachment of upper head of LP
22. Sphenomandibular ligament
• First part of maxillary artery lies lateral to this .
• It is remnants of dorsal part of Meckel’s cartilage.
• Important landmarks for Inferior Alveolar Nerve block.
Stylomandibular ligament
• Formed by thickening of deep lamina of parotid fascia
• Separates parotid gland from submandibular gland
30. Opening and contra lateral side to side movement
Upper head alone acts for closing movement
31.
32. Movements of TMJ
Elevation: all the muscles except LP
Depression : LP
Protrusion : LP and MP
Retrusion: posterior fibers of temporalis
Side to side: LP and MP together
33. TMJ disorders
• The most common condition affecting the
temporomandibular region is temporo
mandibular dysfunction, or myofascial pain
dysfunction syndrome(MPDS)
Pain
Muscle spasm
Limited jaw opening
Joint sounds
34. TMJ dislocation
• Condyle displaced anterior to articular
eminence
• Causes:
Too wide mouth opening
Missing teeth
Trauma
• Anterior dislocation is more common.