4D 2.3 TMJ Joint Flashcards
when the jaw opens slightly what movement occurs
hinge movement along with depression and protrusion
what must occur for the tmj to produce a hinge and slide movement
wide jaw opening
movement of the mandible anteriorly is known as
protrusion
how does lateral excursion work
is the movement of the mandible from left to right
what is the name of the joint that sits between the temporal bone and mandible
synovial noint
name themarked features
what is the glenoid fossa bounded by
articular eminance and the tympanic plate of the temporal bone
the glenoid fossa is very thin, how does it prevent itself from cracking
masticatory forces transmitted through the teeth
the glenoid fossa is an oval depression which is anterior to the EAM
what is the EAM
External Auditory Meatus
which side of the condyle is wider: medial orlateral
medial
the joint surfaces of the condyle, is it hyaline cartilage or fibrous
Fibrous cartilage
how many layers are there to the joint capsule
2 layers
outer fibrous layer
inner synovial membrane
what is the joint capsule attached to
glenoid fossa
which ligament is part of the joint capsule
lateral ligament
what is the function of the lateral ligament
restriction of the following movements
posterior
lateral
inferior movements
contralateral medial movement
limits the extent of pure hinge movement
what are the name of the accesory ligaments of the tmj
stylomandibular ligament
sphenomandibular ligament
pterygomandibular raphe
how many parts are there to the articular disc
5 parts
anterior extension
posterior extension
anterior band
intermediate zone
posterior band
which part of the articular disc is densely innervated
lower layer of the posterior extension
which cranial nerve innervates the tmj
trigeminal
nerve endings which respond to harmful stimuli
nociception
which nerve endings help determine balance of the body
proprioception
which arteries supply the tmj
superfical temporal artery
maxillary artery
when the mouth is slighlty open. is there space in the upper or lower joint
lower joint
when the mouth is wide open. is there space in the upper or lower joint
upper
when protrusion occurs. is there space in the upper or lower joint
upper
what is the major differnce between anterior disc displacement and anterior disc displacement with reduction
with reduction = clicking is present
with reduction = articular disc isnt completley moved anteriorly
if the condyle has moved anteriorly pass the articular eminence, what has occured
muscle spasm
