TMJ and Muscles of Mastication

Question 1

Muscles of Mastication

Answer 1

1. masseter
2. temporalis
3. medial pterygoid
4. lateral pterygoid

Question 2

strongest muscle

Answer 2

masseter

Question 3

action of the masseter

Answer 3

elevate the jaw with superficial fibers causing protraction

Question 4

temporalis action

Answer 4

anterior fibers elevate the mandible, while the posterior fibers retract the mandible

Question 5

lateral pterygoid muscle

Answer 5

thick and triangular muscle with two heads; muscle of mastication that occupies primarily a horizontal position

Question 6

action of the lateral pterygoid

Answer 6

depress, protrude and move the mandible from side to side

Question 7

medial pterygoid muscle action

Answer 7

elevates and protracts the mandible; also moves the jaw from side to side

Question 8

insertion of the sphenoid

Answer 8

coronoid process of the mandible

Question 9

TMJ

Answer 9

bicondylar joint in which the condyles, located at the two ends of the mandible, function at the same time.

Question 10

hinging movement

Answer 10

ginglymoid joint

Question 11

gliding movement

Answer 11

arthrodial joint

Question 12

articular disc location

Answer 12

found between the condyle of the mandible and the glenoid fossa of the temporal bone

Question 13

posterior concave part of the TMJ

Answer 13

mandibular (glenoid) fossa

Question 14

anterior concave part of the TMJ

Answer 14

articular tubercle or eminence

Question 15

glenoid fossa boundaries

Answer 15

anteriorly - articular tubercle

posteriorly - the tympanic portion of the temporal bone which separates it from the EAM

Question 16

condyle poles

Answer 16

medial pole more prominent than lateral pole

Question 17

articular surface

Answer 17

posterior aspect > anterior aspect