Temporomandibular Joint Question And Answers

Temporomandibular Joint

Enumerate the ligaments of the temporomandibular joint and their functions.
Answer:

Ligaments of the temporomandibular joint:

• Fibrous capsule.
• Lateral ligament or temporomandibular ligament.
• Sphenomandibular ligament.
• Sytolomandibular ligament.

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Fibrous capsule Attachments:

• Above – Articular eminence.
• Circumference of the mandibular fossa
• Squamotympanic fissure
• Below- Neck of mandible.

Fibrous capsule Functions:

• It seals the joint space.
• It provides passive stability enhanced by local thickening and active stability from proprioceptive nerve endings.
• Lateral ligament

Lateral ligament:

Lateral ligament Attachments:

• Above – articular tubercle.
• Below – posterolateral aspect of the neck of the mandible.

Lateral ligament Functions:

• It seals the joint space.
• It provides passive stability enhanced by local thickening and active stability from proprioceptive nerve endings.

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Lateral ligament Attachments:

• Above articular tubercle.
• Below – posterolateral aspect of the neck of the mandible.

Lateral ligament  Functions:

• It reinforces and strengthens the lateral part of the capsular ligament.
• It restricts the displacement of the mandible in three different planes.

Sphenomandibular ligament:

Sphenomandibular ligament Attachments:

• Superiorly spine of sphenoid.
• Inferiorly- lingula of mandibular foramen.

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Sphenomandibular ligament Functions:

• It is an accessory ligament.
• It represents a remnant of Meckel’s cartilage.

Stylomandibular ligament Attachments:

• Above – lateral surface of the styloid process.
• Below the angle and adjacent part of the posterior border of the ramus of the mandible.

Stylomandibular ligament Functions:

• It is an accessory ligament.
• It represents the free border of the deep cervical fascia.

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