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Temporomandibular joint: want to learn more about it?

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Temporomandibular joint

The temporomandibular joint (TMJ) is the main connection between the skull and the lower jaw. It comprises:

  • the participating area of the squamous portion of the temporal bone
  • the articular disc within the joint capsule
  • the head of mandible
  • the surrounding ligaments

This article will examine the temporomandibular joint in detail, providing you with information about its compartments, the ligaments holding it together, together with the vascular supply and innervation.

Key facts about the temporomandibular joint
Compartments Superior (translational movement) and inferior compartments (rotational movement)
Joint capsule
Limits/borders - border of mandibular fossa and neck of the mandible above the pterygoid fovea
Ligaments Collateral, temporomandibular, stylomandibular, and sphenomandibular ligaments
Vascular supply Deep auricular, superficial temporal, and anterior tympanic arteries
Innervation Mandibular, masseteric, and deep temporal nerves, together with the otic and superior cervical ganglions

Compartments

The joint is separated into a superior and an inferior compartment by the articular disc.

  • The superior compartment is bordered superiorly by the mandibular fossa of the temporal bone and inferiorly by the articular disc itself. It contains 1.2 mL of synovial fluid and is responsible for the translational movement of the joint.
  • The inferior compartment has the articular disc as a superior border and the condyle of the mandible as an inferior border. It is slightly smaller with an average synovial fluid volume of 0.9 mL and allows rotational movements.

Capsule and ligaments

The joint capsule originates from the border of the mandibular fossa, encloses the articular tubercle of temporal bone and inserts at the neck of mandible above the pterygoid fovea. It is so loose that the mandible can naturally dislocate anteriorly without damaging any fibers of the capsule.

Keep learning and testing yourself on the anatomy of the skull with our skull bones quizzes and diagrams. 

The TMJ is supported by the following ligaments:

  • The medial and lateral collateral ligaments (also known as the discal ligaments) help connect the medial and lateral sides of the articular disc to the same side of the condyle.
  • The temporomandibular ligament is located on the lateral aspect of the capsule and its function includes preventing the lateral or posterior displacement of the condyle.
  • The stylomandibular ligament arises from the styloid process and attaches to the mandibular angle. It is responsible for allowing the mandible to protrude.
  • The sphenomandibular ligament stretches between the spine of the sphenoid bone and the lingula of the mandible. It contributes to the limitation of extensive protrusive movements and jaw opening.

Vascular supply

The TMJ is supplied by three arteries. The main supply comes from the deep auricular artery (from the maxillary artery) and the superficial temporal artery (a terminal branch of the external carotid artery). In addition the joint is provided by the anterior tympanic artery (also a branch of the maxillary artery). The venous blood drains through the superficial temporal vein and the maxillary vein.

To find it out more details about the neurovasculature of the head that supplies the temporomandibularj joint, take a look below:

Innervation

The mandibular nerve (third branch of the trigeminal nerve) provides the main nerve supply of the TMJ. Additional innervation comes from the masseteric nerve and deep temporal nerves. Parasympathetic fibers of the otic ganglion stimulate the synovial production. Sympathetic neurons from the superior cervical ganglion reach the joint along the vessels and play a role in pain reception and the monitoring of the blood volume.

Temporomandibular joint: want to learn more about it?

Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster.

What do you prefer to learn with?

“I would honestly say that Kenhub cut my study time in half.” – Read more. Kim Bengochea Kim Bengochea, Regis University, Denver

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