Muscles and TMJ

Question 0

What muscles are involved in elevating the mandible?

Answer 0

anterior/vertical fibers of temporalis muscles
masseter muscles
medial pterygoid muscles

Question 1

Bilateral contraction of the posterior fibers of the temporalis results in what movement?

Answer 1

retrusion of the jaw

assisted by suprahyoids, especially both parts of the digastric

Question 2

What muscle is used in a working lateral exursion movement?

Answer 2

the contralateral lateral pterygoid

Question 3

What type of joint is the TMJ?

Answer 3

diathrodial (freely movable) and
synovial (upper and lower synovial cavities) as well as
ginglymoathrodial (combined hinge and sliding)
articulating surfaces are lined with avascular fibrous/fibrocartilage instead of hyaline)

Question 4

Which muscles are involved in depressing the mandible?

Answer 4

Lateral pterygoids
Anterior belly of the Digastic
Omohyoids

Question 5

Which muscles are involved in protrusion of the mandible?

Answer 5

Lateral pterygoids

Question 6

Which muscles are involved in retraction of the mandible?

Answer 6

Posterior fibers of the temporalis