TMJ: Muscles of Mastication

Question 1

Protrusion:

Answer 1

both lateral pterygoids

Question 2

Stabilize the disc of TMJ:

Answer 2

superior head of lateral pterygoid

Question 3

Left movement:

Answer 3

right lateral pterygoid contraction

Question 4

Translation:

Answer 4

superior compartment

Question 5

Mandibular sling muscles:

Answer 5

masseter, medial pterygoid

Question 6

Muscle that helps in stabilization of maximum intercuspation:

Answer 6

superior head of lateral pterygoid (disc stabilization)

masseter (mandible stabilization)

Question 7

Origin + Insertion of masseter:

Answer 7

Origin: zygomatic bone
Insertion: lateral ramus of mandible

Question 8

Origin + insertion of temporalis:

Answer 8

Origin: temporal fossa, parietal bone
Insertion: coronoid process

Question 9

Origin + insertion medial pterygoid:

Answer 9

Origin: lateral plate, sphenoid bone
Insertion: medial ramus, mandible

Question 10

Origin + insertion lateral pterygoid:

Answer 10

Origin: lateral plate, sphenoid bone
Insertion: neck of mandible

Question 11

Masseter function:

Answer 11

elevate mandible (close mouth)

Question 12

Temporalis function:

Answer 12

Anterior + middle fibers: elevate mandible (close mouth)

Posterior fibers: retrude

Question 13

Medial pterygoid function:

Answer 13

elevate mandible (close mouth)

Question 14

Lateral pterygoid function:

Answer 14

Protrude/depress mandible (open mouth)

Lateral movements

Question 15

R. mandibular excursion is done by:

Answer 15

L. lateral pterygoid