Temporomandibular joint

Question 1

Temporomandibular joint (TMJ)

Answer 1

the joint on each side of the head that allows for movement of the mandible for speech and mastication.
Innervation- Trigeminal nerve (V3)
Blood supply- Branches of the external carotid artery.

Question 2

TMJ articulation

Answer 2

Two sides of articulations, one on each side
Temporal bone (squamous portion) articulates with the mandible at the tmj by way of disk of the joint
articulating bony surfaces are covered by fibrocartilage.

Question 3

Disc divides the TMJ into 2 compartments

Answer 3

Upper & lower synovial cavities

Question 4

Gliding movement of the TMJ

Answer 4

occurs mainly between the disc and the articular eminence in the upper synovial cavity, with the disc plus the condyle moving forward or backward, down and up the articular eminence.

Question 5

Protrusion

Answer 5

involves the bilateral contraction of both of the lateral pterygoid muscles. (Bringing the lower jaw forward involves protrusion of the mandible.)

Question 6

Rotational movement of the TMJ

Answer 6

occurs mainly between the disc and the mandibular condyle in the lower synovial cavity.

Question 7

Depressing

Answer 7

(opening) the jaw is accomplished by contraction of

Lateral Pterygoid muscle.

Question 8

Elevating

Answer 8

(closing) jaw involves bilateral contraction of:
Masseter
Temporalis
Medial Pterygoid