Anatomy Of Temporomandibular Joint

Anatomy Of Temporomandibular Joint

Temporomandibular Joint Intraarticular disc:

• It is an oval plate of fibrocartilage & divides the joint into two compartments
• It represents the primitive insertion of lateral pterygoid muscle
• Posteriorly the disc splits into upper & lower lamellae by venous plexus

1. 1. Upper lamellac
      • Attached to Squamotympanic fissure
   2. Lower lamellae
      • Attached to posterior surface of neck of the mandible
      • Parts
        • Structurally the disc contains five parts
          1. Anterior extension
          2. Anterior thick band
          3. Intermediate zone
          4. Posterior thick band
          5. Bilamellar region

Read And Learn More: BDS Previous Examination Question And Answers

Temporomandibular Joint Applied anatomy:

1. Dislocation of mandible
   • Occurs during excessive opening of the mouth
   • Head of mandible may slip into Infratemporal fossa
   • Reduced by exerting downward traction of ramus of mandible & elevation of chin
2. Derangement of the articular disc
   • May occur due to overclosure or malocclusion
   • Results in clicking & pain during movements of the jaw
3. Operations of TMJ
   • May damage VII nerve & Auriculotemporal nerve