TMJ Flashcards
(15 cards)
lateral ligament
stylomandibular ligament
sphenomandibular ligament
lateral ligament- prevent post dislocation
stylomandibular ligament- prevent inf dislocation
sphenomandibular- prevent inf dislocation “swinging rope” to mandible
is tmj congruent? why?
NO, its INCONGRUENT bc both articular eminence and mandibular condyle are convex. this is addressed by a biconcave articular disc covered in fibrocartiledge
what muscle maintains the resting position of the tmj joint
temporalis M
tmj: roll and slide for depression
early phase- roll posterior
late phase- slide anterior
tmj: roll and slide for elevation
early phase- slides posterior
late phase- rolls anterior
tmj: roll and slide for protrusion
no roll
Anterior and slightly inferior slide of condyle and disc
tmj: roll and slide for retrusion
no roll
posterior and slightly superior slide of condyle and disc
tmj: roll and slide for left and right lateral excursion:
where does the tmj attach anteriorly and posteriorly and which is weaker
anteriorly: joint capsule and lat pteryjoid (this is weak so ant dislocation is predisposed)
post: laminae
what is jaw deflection at the TMJ joint
jaw shifts to one side from midline, deflecting to the side that is the most tight, and remains there until max opening
what is jaw deviations at the TMJ joint
Jaw deviates to one side during openings but returned to midline either an S curve or C curve
explain articular disc displacment and the 2 stagees: with reduction and without
with reduction: clicking
without reduction: disc does not relocate so limited mandibular motion
What are some components of the TMJ joint capsule
elastic
firm medially and laterally
thing and loose anterior and posterior
which muscles created bite and shear force
masseter ans medial pterygoid (specificlly R pt and L mass produce L lat deviation which produces force)
Explain how regional inter-dependence happens between head and neck and TMJ
