4D 2.3 TMJ Joint

Question 1

when the jaw opens slightly what movement occurs

Answer 1

hinge movement along with depression and protrusion

Question 2

what must occur for the tmj to produce a hinge and slide movement

Answer 2

wide jaw opening

Question 3

movement of the mandible anteriorly is known as

Answer 3

protrusion

Question 4

how does lateral excursion work

Answer 4

is the movement of the mandible from left to right

Question 5

what type of joint sits between the temporal bone and mandible? (fibrous, cartilaginous, sinovial?)

Answer 5

synovial joint

Question 6

name themarked features

Answer 6

Question 7

which two anatomical features create the space for the glenoid fossa to exist?

Answer 7

articular eminance and the tympanic plate of the temporal bone

Question 8

the glenoid fossa is very thin, how does it prevent itself from cracking

Answer 8

masticatory forces transmitted through the teeth

Question 9

the glenoid fossa is an oval depression which is anterior to the EAM

what is the EAM

Answer 9

External Auditory Meatus

Question 10

which side of the condyle is wider: medial orlateral

Answer 10

medial

Question 11

the joint surfaces of the condyle, is it hyaline cartilage or fibrous

Answer 11

Fibrous cartilage

Question 12

how many layers are there to the joint capsule

Answer 12

2 layers

outer fibrous layer

inner synovial membrane

Question 13

what is the joint capsule attached to

Answer 13

glenoid fossa

Question 14

which ligament is part of the joint capsule

Answer 14

lateral ligament

Question 15

what is the function of the lateral ligament

Answer 15

restriction of the following movements

posterior

lateral

inferior movements

contralateral medial movement

limits the extent of pure hinge movement

Question 16

what are the name of the accesory ligaments of the tmj

Answer 16

stylomandibular ligament

sphenomandibular ligament

pterygomandibular raphe

Question 17

how many parts are there to the articular disc

Answer 17

5 parts

anterior extension

posterior extension

anterior band

intermediate zone

posterior band

Question 18

which part of the articular disc is densely innervated

Answer 18

lower layer of the posterior extension

Question 19

which cranial nerve innervates the tmj

Answer 19

trigeminal

Question 20

nerve endings which respond to harmful stimuli

Answer 20

nociception

Question 21

which nerve endings help determine balance of the body

Answer 21

proprioception

Question 22

which arteries supply the tmj

Answer 22

superfical temporal artery

maxillary artery

Question 23

when the mouth is slighlty open. is there space in the upper or lower joint

Answer 23

lower joint

Question 24

when the mouth is wide open. is there space in the upper or lower joint

Answer 24

upper

Question 25

when protrusion occurs. is there space in the upper or lower joint

Answer 25

upper

Question 26

what is the major difference between anterior disc displacement and anterior disc displacement with reduction

Answer 26

with reduction = clicking is present

without reduction = articular disc isnt completley moved anteriorly

Question 27

if the condyle has moved anteriorly pass the articular eminence, what has occured

Answer 27

muscle spasm