TMJ: Ch 8

Question 1

the TMJ consists of

Answer 1

• 2 bones
• 4 ligaments
• 4 muscles
• 1 joint capsule

Question 2

TMJ articulation

Answer 2

• mandibular fossa: concave
• mandibular condyle: convex

Question 3

The TMJ is considered a

Answer 3

modified hinge joint

Question 4

the TMJ consists of an ____________ _______

Answer 4

articular disk

Question 5

the TMJ consists of 3 lig

Answer 5

• temporomandibular lig
• sphenomandibular lig
• stylomandibular lig

Question 6

the TM lig limits

Answer 6

inf, post, and lat movements

Question 7

the sphenomandibular lig limits

Answer 7

ant translation

Question 8

the stylomandibular lig limits

Answer 8

ant translation

Question 9

the TMJ osteokinematics

Answer 9

• depression/elevation
• lateral deviation
• protrusion/retrusion

Question 10

TMJ norm for depression

Answer 10

40-50 mm

Question 11

TMJ norm for protrusion

Answer 11

7 mm

Question 12

TMJ norm for lat deviation

Answer 12

9mm

Question 13

TMJ arth for depression

Answer 13

lower joint space: glides anteriorly, rolls posteriorly
upper joint space: disk is moving in the same direction as the glide

Question 14

TMJ arth for elevation

Answer 14

lower joint space: condyle and disk glide posteriorly

Question 15

TMJ elevation and depression is going to occur in what plane

Answer 15

sagittal; frontal axis

Question 16

TMJ protrusion and retrusion

Answer 16

The mandibular condyle and disk move in one movement and only have a glide

Question 17

TMJ protrusion and retrusion occur in what plane

Answer 17

horizontal

Question 18

TMJ arth for protrusion

Answer 18

anterior glide of condyle and disk

Question 19

TMJ arth for retrusion

Answer 19

posterior glide of condyle and disk

Question 20

TMJ lat deviation is going to occur in what plane

Answer 20

horizontal plane; vertical axis

Question 21

during lat deviation,

Answer 21

one condyle spins (the condyle that is on the side of deviation) in one fossa while the other glides anteriorly

Question 22

4 primary muscles of mastication

Answer 22

• temporalis
• masseter
• lateral pterygoid
• medial pterygoid

Question 23

the muscles of mastication are innervated by

Answer 23

the mandibular branch of the trigeminal nerve: cranial nerve V

Question 24

trigeminal neuralgia

Answer 24

damage to the mastication muscle nerve (CN V); can be episodic or constant
- sharp, shooting pain

Question 25

pucker

Answer 25

orbicularis oris

Question 26

close eyelid

Answer 26

orbicularis occuli

Question 27

raises eyebrow

Answer 27

frontalis

Question 28

wrinkles forehead

Answer 28

corrugator supercilli

Question 29

depresses medial eyebrows

Answer 29

procerus

Question 30

compress nostrils

Answer 30

nasalis

Question 31

elevated mouth angle

Answer 31

levator anguli oris

Question 32

smile

Answer 32

zygomaticus

Question 33

pout

Answer 33

mentalis

Question 34

compress cheek

Answer 34

buccinator

Question 35

frown

Answer 35

depressor anguli oris

Question 36

fright

Answer 36

platysma

Question 37

bells palsy

Answer 37

temporary facial paralysis that results from injury to the facial nerve VII, secondary to a viral infection of herpes zoster; drooping, drooling, etc.