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(5) TMJ (Anatomy (Condyle (Long Axis: Medial Backwards, Not symetrical,…
(5) TMJ
Anatomy
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General relations:
- Entire TMJ between Temporal Bone & Mandible
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Ligaments
Minor
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Collateral/Discal
- Connect Disc to Condyle
- Unstretchy
- Collagenous
Major
Temporomandibular / Lateral
- Limit opening
- From Zygomatic Process to Lateral Neck of Mandible
- Inner Horizontal
- Outer Oblique
Stylomandibular
- From Styloid Process to Angle of Mandible
- Separates infratemporal region from parotid
- Styloid process to angle of mandible
- Separates parotid and submandibular
Sphenomandibular
- From Spine of Sphenoid to the Lingula of Mandible
- Sphenoid bone to lingula of mandible
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Mandible
Fracture chance: Highest Neck of Condyle (30%), Body (25%), Angle (25%), Parasymphyseal/Mental (15%), Ramus (3%), Coronoid Process(2%)
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Movements
Physiological
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Upper Half
- Articular Disc & Articular Eminence
- Translation (Gliding)
Lower Half
- Condylar Head & Articular Disc
Rotation (Hinge)
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Joint Type: Ginglymoarthodial
- Most commonly used
- Weight bearing
- Most sides move at same time
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