TMJ Flashcards
why is it called the temporomandibular joint?
because it is the junction of temporal and mandible
3 TMJ function
- speech
- masitcation
- Deglutition-swallowing
TMJ innervated by what cranial nerve?
V3
Blood supply comes from?
branches of external carotid
Anatomy of TMJ:
Temporal bone, Fibrocartilage, and Enclosed characterisitics
Temporal-articulating surfaces include the articular eminence and glenoid fossa
Fibrocartilage-for articulating surface
Enclosed-in fibrous joint capsule
two synovial cavities found within the joint disc
-meniscus creates superior and inferior compartments
what does the synovial fluid secreted by membranes act as
acts as a lubricant for condyle
pathology of joint disc
-if there is problems such as:
-pain on function
-limiting function
-stuck on opening
then there is something wrong
what muscles allow the mandible to move?
- masster: hyperstrophy, tenderness, and atrophy
- temporalis
- medial pterygoid
what are the two disc compartment motions
- temporodiscal: superior compartment, and motion is translatory
- condylodiscal: inferior compartment, and motion is rotational
what order does the disc compartments work?
- to open the mandible is rotational
- to open the mandible wider is translatory
- to close the mandible is translatory
- to close the mandible all the way is rotational
function of ligaments
to create an envelope of movement
3 joint ligaments used
- tempromandibular which prevents excessive retraction
- sphenomandibular which prevents excessive protrusion
- stylomandibular which prevents excessive protrusion
Protrusion movement and muscles used
movement: both compartments gliding
muscles: bilateral L. pyterygoids (inferior heads)
Retraction movement and muscles used
movement: both compartments gliding
muscles: bilateral posterior temporalis