quiz #7 - TMJ Flashcards
temporomandibular Joint (TMJ) - type & movements
synovial, condyloid & hinge (also plane), diarthrosis, biaxial
depression (jaw opening), elevation (jaw closing), lateral deviation (left & right), protraction & retraction, slight rotation
temporomandibular Joint (TMJ) - articular surfaces
convex condyles of mandible on concave mandibular fossa
temporomandibular Joint (TMJ) - ligaments
-fibrous joint capsule (medial & lateral collateral)
-temporomandibular
-stylomandibular
-sphenomandibular
-fibrocartilaginous articular disc that divides joint into two cavities
unique feature of TMJ
fibrocartilaginous articular disc that separates synovial cavity of joint into superior/upper joint cavity & inferior/lower joint cavity
disc moves forward as mouth opens
upper joint =
plane (gliding) - happens second
lower joint =
hinge - happens first
TMJ - articular surfaces
articular disc
articular tubercle
mandibular fossa
mandibular condyle
joint capsule & all ligaments limit motions of mandible only, especially…
depression & retrusion
TMJ - main ligaments
fibrous capsule (medial & lateral collateral ligaments)
temporomandibular ligament (lateral ligament)
TMJ - accessory ligaments
stylomandibular ligament
sphenomandibular ligament
TMJ - disc
fibrocartilaginous disc
protrusion is limited by…
stylomandibular ligament
as the mouth opens, rotation of mandibular condyles occurs around the… followed by…
lower joint space
followed by translation of articular disc on upper joint space down to articular eminence
TMJ is like a hinge on a…
moveable base
TMJ - movements
elevation of mandible (closes mouth)
depression of mandible (opens mouth)
protraction/protrusion of mandible
retraction/retrusion of mandible
lateral deviation (right & left)
