Quiz 5 - Kinesiology 2

TMJ (temporomandibular) connects ____ and ____ of the ____

Mandibular condyle, mandibular fossa, temporal bone

TMJ (temporomandibular) is a ____ join

Load bearing joint

The articular disc rests between the ____ and ____

Mandibular fossa, mandibular condyle

Articular disc posterior part has ____, ____, and ____, anterior has _____

Collagen fibers, elastic soft tissue, profuse nerve supply, upper lateral pterygoid fibers

Articular disc is ___ shape and has ___ anterior, ___ middle, ___ posterior

Biconcave (doughnut), thick, thin, variable

Provide stability during chewing

Joint capsule

Protrusion

Move jaw forward

Retrusion

Move jaw backward

Protrusion/retrusion amount

6mm

Lateral excursion

Move jaw sideways

Lateral excursion amount

7mm

Mandibular depression: ____ or ___

Opening, incisal opening

Mandibular elevation: ____ or ___

Closing, clenching

Mandibular opening/closing rotates for first ____ and than ____

11mm, translates anterior

Muscles that clench jaw

Masseter, temporalis

Lateral pterygoid

Upper fibers attach to ___ contract with ___

Lower fibers attach to ___ contract with ___

Disc closing, mandible neck opening

Medial pterygoid unilaterally action

Lateral deviate to opposite side

Digastrics (medial /lateral) action

Stabilize hyoid in opening, assist in protrusion/retraction

Disc displacement with reduction (disc movement)

Condyle shift off disc, click with closing and opening

Disc displacement with reduction (pain)

Opening, closing

Disc displacement without reduction (disc movement)

Disc displaced forward, condyle pinches posterior disk

Disc displacement without reduction (pain)

Rest and use

Disc displacement without reduction (end feel)

Limited opening and hard end feel

Lateral pterygoid spasm

Jaw locks

Lateral pterygoid spasm (position)

Contralateral shift, protrusion, back teeth dont touch

Myofascial pain dysfunction

Tight muscles

Jaw closed lock:___, open lock:___

Disc displacement without reduction, lateral pterygoid spasm

Temporomandibular joint (TMJ) joint type

Diarthrodial joint