TMJ Flashcards
(25 cards)
temporomandibular joint type
synovial
diarthrosis
CONDYLOID & HINGE & PLANE
biaxial
artic surfaces of TMJ joint
CONVEX condyles of mandible
CONCAVE mandibular fossa
movements of TMJ
depression (jaw opening)
elevation (jaw closing)
lateral deviation
protraction
retraction
slight rotation
upper joint = what type of joint
plane (gliding)
lower joint =
hinge (ginglymus)
what is the unique feature of the TMJ
the fibrocartilaginous articular disc that separates the synovial cavity of the joint into a superior cavity and inferior cavity
the disc moves ________ as the mouth opens
forward
what happens first when you open jaw
disc is still in place
rotation occurs - hinge action predominates
what happens when jaw is opened widely
hinge and gliding actions combined
what bones make up TMJ
temporal bone
mandible
articular surfaces ** of TMJ
articular disc
articular tubercle
mandibular fossa
mandibular condyle
TMJ ligaments (2)
fibrous capsule (med & lat collateral)
temporomandibular
TMJ accessory ligaments
stylomandibular
sphenomandibular
TMJ disc
fibrocartilaginous disc
what ligament limits protrusion
stylomandibular
as the mouth opens, rotation of the mandibular condyles occurs around lower joint space
followed by translation of articular disc on the upper joint space down to the articular eminence
loose packed of TMJ
mouth slightly open, lips together, teeth not in contact
close packed position of TMJ
teeth tightly clenched
capsular pattern of restriction
limitation of mouth opening
normal end feels
opening = tissue stretch
closing = bone to bone
what action does temporalis do
closes jaw, moves jaw backwards
what action does medial pterygoid
closes jaw
elevation and protraction of mandible
what actions does masseter do
closes jaw
elevates mandible during chewing & clenches teeth
what actions does the lateral pterygoid do
opens jaw
protraction of mandible
