Temporomandibular Joint

The temporomandibular joint is an articulation between the…

temporal bone and the mandible

__________ is the small fibrous pad between bones of the TMJ

Articular disk

Where are the synovial cavities located?

above and below the articular disk

Purpose the synovial cavities

Allows the surfaces to rub without irritation

Synovial cavities are line with epithelium and secrete _________ ______.

synovial fluid

What are the 3 segments of the articular disc regions?

posterior, intermediate and anterior

Where is the disc the thinnest?

Intermediate

Where is the disc the thickest?

Posterior

What is the circle pointing to?

Capsule

Label the circled area

Articular disc intermediate region

What are the two movements of the TMJ?

Rotational and gliding

Which movement involves the synovial cavity between the disk and the condyle below?

Rotational movement

Which movement involves the condyle and disk moving forward until slightly anterior to the crest of the articular eminence?

Gliding movement

The gliding movement is between the disk and the ____________ bone.

Temporal

Popping and clicking results from..

Disk is pulled too far forward when opening

T/F the popping and clicking from internal TMJ problems can always be heard and seen.

False, it can be too faint to hear but felt during palpation and frequently only visible when it’s occurring on one side.

Grinding sounds result from….

Sounds may come from adhesion in synovial joint, arthritic changes, perforation of the disk.

Subluxation results from…

When a person opens his/her mouth too wide and cannot close it or when closing causes popping

Bruxism is …

Tooth grinding

T/F most pain isn’t in the joint but the muscles

True