TMJ - drolinger

Question 1

tmj is the articulation of

Answer 1

squamous portion of temporal bone and condyle of mandible

Question 2

tmj is what 2 types of synovial joints

Answer 2

ginglymoid (hinge) annd arthroidial (gliding)

Question 3

the tmj is classified as a compound joint but it only has two bones. what qualifies it as a compound joint?

Answer 3

the articular disc serves as a non ossified bone that allows for complex movements of the joint

Question 4

t/f. you need to fix all cases with unaligned condyles

Answer 4

false. if theyre asymptomatic, you could cause more problems if you tried to fix it. also, most people’s condyles are out of line

Question 5

what does squamotympanic fissure do

Answer 5

provides attachment for the joint capsule and the retrodiscal pad

Question 6

t/f. articular surface is hyaline cartilage

Answer 6

FALSE! it is avascular fibrous connective tissue with main loadbearing area on the lateral aspect of the condyle

Question 7

why is the fibrocartilagenous zone important

Answer 7

it is the only zone that allows the joint to regenerate and fix itself

Question 8

t/f. the central part of the articular disc is avascular and aneural, whereas the peripheral areas are vascular and innervated

Answer 8

true.

Question 9

location of band of articular disc in relation to condyle

Answer 9

anterior - thick, anterior
intermediate - thin, on articular eminence
posterior - thick, superior

Question 10

t/f. the anterior portion of the articular disc is connected to the condyle.

Answer 10

false. it is attached to the superior head of the lat pterygoid. the med/lat portions of the disc are attached to the condyle

Question 11

3 parts of the bilaminar zone

Answer 11

superior lamina (elastic fibers), retrodiscal pad (highly vascular and innervated), and inferior lamina (collagen fibers)

Question 12

what is the bilaminar zone?

Answer 12

highly distortable organization of fibers that is located posterior to the articular disc

Question 13

part of the tmj that allows translation

Answer 13

superior compartment (between temporal bone and articular disc)

Question 14

part of the tmj that allows rotational movement

Answer 14

inferior compartment (between articular disc and condyle)

Question 15

t/f. the tmj capsule is lined by a highly vascular synovial membrane

Answer 15

true.

Question 16

t/f the ligaments of the tmj are composed of collagenous connective tissue and will stretch.

Answer 16

false. they will NOT stretch

Question 17

outer oblique ligament (o/i/a)

Answer 17

largest band of the temporomandibular ligament that limits the opening of the mandible;
o: articular tubercle; i: inferior condyle

Question 18

inner horizontal ligament (o/i/a)

Answer 18

smallest band of the temporomandibular ligament that limits the posterior movement of the disc and condyle;
o: articular tubercle; i: lateral part of the condyle and disc

Question 19

stylomandibular ligament (o/i/a/composition)

Answer 19

o: styloid process; i: post margin of mandibular ramus; limits anterior protrusion; thick, deep cervical fascia

Question 20

sphenomandibular ligament (o/i/a/composition)

Answer 20

o: spine of sphenoid; i: lingula of the mandible; pivot that maintains the same amount of tension during opening and closing; remnants of meckles cartilage

Question 21

arterial supply of the tmj

Answer 21

superficial temporal
deep auricular artery
anterior tympanic

Question 22

venous drainage of the tmj

Answer 22

superficial temporal

maxillary

Question 23

innervation of tmj

Answer 23

V3:
auriculotemporal (sensory)
masseteric
post deep temporal (motor)

Question 24

sensory pathway

Answer 24

1st order: receptive field to brainstem via CNV
2nd order: synapse in the trigeminal nucleus in brainstem
3rd order: terminates in primary somatosensory cortex

Question 25

muscles that open mouth

Answer 25

lat pterygoid
suprahyoid
infrahyoid

Question 26

muscles that close mouth

Answer 26

temporalis
masseter
medial pterygoid

Question 27

muscles that protrude mand

Answer 27

masseter

lat/med pterygoid

Question 28

muscles that retrude mandible

Answer 28

temporalis

masseter (deep fibers)

Question 29

chewing muscles

Answer 29

ipsilateral temporalis
contralateral pterygoid
masseter

Question 30

muscles that most commonly attach to art disc

Answer 30

lat pterygoid

midmed bundle of temporalis

Question 31

muscles that occasionally attach to art disc

Answer 31

discotemporal bundle of temporalis
zygomaticomandibularis
masseter

Question 32

direction of vector of force moving the mandible

Answer 32

anterior and medial

Question 33

2 movements of opening mandible

Answer 33

rotation and translation