TMJ Flashcards
What are the 3 types of fibrous joints?
1-Sutures
2-Tooth socket
3-Syndesmosis
What are the 2 types of cartilaginous joints?
1-Primary (synchondroses)
2-Secondary (Symphyses)
What type of joint is fluid filled? What joint in the face is of this type? What is the special name for this type of joint besides the generic one requested above?
Synovial joint
*TMJ is a synovial sliding or ginglymoid joint
What are the 3 main boney structures composing the TMJ?
1-Glenoid fossa
2-Articular eminence
3-Condyle
Meckels cartilage forms the mandible and the malleus through intramembranous ossification. The malleus articulates with the incus forming what?
Primary joint
*this is before the development of the condyle
Once the temporal bone forms articulates with the condyle what is formed?
The TMJ or secondary joint
What covers the articular surfaces of the joint in the TMJ?
Fibrous connective tissue
*instead of the typical hyaline cartilage
What is the fibrous covering of the condyle made of avascular type I collagen called?
Lamina splendens
The glenoid fossa is covered by a ____ fibrous layer while the articular eminence is overlaid by a _____ fibrous layer
Thin, Thick
Where is cartilage found in the TMJ?
Deep in the condyle and articular eminence.
*This undergoes endochondral ossification by 30 yr old and implies potential remodeling of the joint
Which ligament is the most important for restricting lateral and medial movement of the TMJ?
Temporomandibular ligament
what 3 planes do temporomandibular ligaments restrict?
1-Medial-lateral
2-Superior-inferior
3-Posterior
What are two other ligaments that limit the inferior movement of the TMJ when the jaw is open?
1-Sphenomandibular ligament
2-Stylomandibular ligament
The articular disk is ______ with to the joint capsule
Continous
What are the two layers of the synovial membrane?
1-Subintima
2-Intima
