Articular Disc

Articular Disc

Question 1. Articular disc
Answer:

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• It is an oval plate of fibrocartilage & divides the joint into two compartments
  1. Upper compartment
     • Permits gliding movements
  2. Lower compartment
     • Permits gliding & rotatory movements
     • It represents the primitive insertion of lateral pterygoid muscle
     • Posteriorly the disc splits into upper & lower lamellae by venous plexus
       1. Upper lamellae
          • Attached to Squamotympanic fissure
       2. Lower lamellae
          • Attached to posterior surface of neck of the mandible

“Steps to explain the location of the articular disc: Temporomandibular joint vs other joints: Q&A guide”

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Articular disc Parts:

• Structurally the disc contains five parts
• Anterior extension
• Anterior thick band
• Intermediate zone
• Posterior thick band
• Bilamellar region

Articular disc Surfaces:

“Role of the articular disc in the temporomandibular joint: Questions answered”

Question 2. Inferior Alveolar Nerve
Answer:

• It is a branch of posterior division of mandibular nerve

Inferior Alveolar Nerve Course:

• Emerges under lower border of the lateral pterygoid
• Passes downward & forward between the ramus of mandible & Sphenomandibular ligament Enters the mandibular foramen
• Runs in a bony canal below the teeth & finally divides into incisive & mental nerves

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