is a compound ginglymodiarthroidal joint

bilateral joint/hinge & sliding

Parts of TMJ

Bones

temporal bone- mandibular fossa

                        articular eminence

mandible- mandibluar condyle

Parts of TMJ

Articular disc (meniscus)

composed of fibrocartilage

located between the temporal bone and condyle on each side

dsic divides the TMJ into 2 synovial cavities on upper and lower

synovial fluid to help lubricate the joint

 surrounds entire joint, inner surface is a synovial membrane that secretes lubricating synovial fluid

 from zygomatic process to neck of condyle, it prevents the excessive retraction of mandible

 from sphenoid bone to lingula of mandible, taut when protruded, limits downward & forward movement

from styloid process of temporal bone to the posterior border of angle of ramus

limits moving forward

upper head into meniscus

lower head into condyle

upper compartment allows sliding movement

lower compartment allows hinge movement (condyle rotates)

opening movement

a. external pterygoid-very weak

b. suprahyoid muscles- for these to work the hyoid bone is stabilized by infrahyoid

nonsurgical- bite plane

surgical- reposition disc or amputate condyle

TMPD

chronic joint tenderness

swelling and painful muscle spasms

difficulties of joint movement

Causes of Chronic head and facial pain

oro-dental

vascular

neurological

neoplastic

arthrogenic:

osseus

tendinous

ligamentous

disc derangement

muscular:

occlusion

psychological stress

lateral pterygoids