Flashcards in Temporomandibular joint Deck (27):
What bones form the Temporomandibular joint?
Temporal bone of the cranium
What are the main movements allowed by the Temporomandibular joint?
Side to side movement
Where is the Temporomandibular joint?
Anterior to the tragus
What 3 bones articulate at the Temporomandibular joint?
Articular tubercle (Squamous part of Temporal bone)
Head of the Mandible
What is unique about the Temporomandibular joint?
Articulating surfaces never touch due to the articular disc separating them.
What does the articulating disc split the joint into?
What type of joint is the Temporomandibular joint?
Synovial (Has a synovial membrane)
What type of cartilage covers the articulation surfaces?
Fibrocartilage (Not Hyaline as would b expected)
What are the 3 extra capsular ligaments?
What is the lateral ligament attached to?
Beginning of the articular tubule to the mandibular neck
What is the function of the lateral ligament?
Thickening of the joint capsule
Prevents posterior dislocation of the joint
What is the Spenomandibular ligament attached to?
Sphenoid spine to mandible
What is the Stylomandibular ligament formed from?
Thickening of the fascia of the Parotid gland and facial muscles
What is the function of the Stylomandibular ligament?
Supports the weight of the jaw
What muscles control the movement of the Temporomandibular joint?
Muscles of mastication
Muscles of Hyoid bone
What movements does the upper section of the joint do?
Protrusion of mandible
Retraction of mandible
What muscle performs Protrusion of the mandible?
What muscle performs Retraction of the mandible?
What movements does the lower section of the joint do?
Elevation of mandible
Depression of mandible
What is the main cause of depression of the mandible?
What muscles aid with depression of the mandible?
What muscles aid elevation of the mandible?
*Contraction of them, very strong movement*
How can arthritis effect the Temporomandibular joint?
Inflammation occurs in the joint causing the patient to commonly to have jaw pain, stiffness and joint grating
What can cause dislocation of the Temporomandibular joint?
Blow to the side of the face
Taking a large bite
What occurs in a dislocation of the Temporomandibular joint?
Head of mandible slips out of the mandibular fossa and is pulled anteriorly so the patient is unable to close their mouth.
Why are posterior dislocations of the Temporomandibular joint rare?
A lot of force is needed to overcome the postglenoid tubercle and strong intrinsic lateral ligament