Temporomandibular Joint Flashcards
What are the joint classifications of the temporomandibular joint?
- complex joint
- synovial (diarthrosis) condylar
- synovial (diarthrosis) bicondylar
- synovial (diarthrosis) arthrodia
- synovial (diarthrosis) ginglymus
What are the articular surfaces of the temporomandibular joint?
- condylar surface of the mandible
- glenoid/mandibular fossa of the temporal bone
- an articular disc
What are the extracapsular ligaments of the temporomandibular joint?
- temporomandibular/lateral lig.
- stylomandibular lig.
- sphenomandibular lig.
What are the attachment sites of the temporomandibular/lateral lig.?
zygomatic process and articular tubercle of the temporal bone to neck of the mandible
What does the temporomandibular/lateral lig. represent?
a thickening of the fibrous capsule of the temporomandibular joint
What are the attachment sites of the stylomandibular/lateral lig.?
styloid process of the temporal bone to the angle of the mandible
What does the stylomandibular lig. represent?
a thickening of the deep cervical fascia
What are the attachment sites of the sphenomandibular/lateral lig.?
the spine of the sphenoid bone to the lingula of the mandible
What does the sphenomandibular lig. represent?
a remnant of Meckel’s cartilage of the first branchial arch
What muscles are vital to movement of the temporomandibular joint?
- lateral pterygoid
- medial pterygoid
- masseter
- temporalis
What muscles act to depress the mandible or open the mouth?
- lateral pterygoid
- suprahyoid
- infrahyoid
What muscles act to elevate the mandible or close the mouth?
- temporalis
- masseter
- medial pterygoid
What muscles act to protract the mandible or protrude the chin?
- masseter
- medial pterygoid
- lateral pterygoid
What muscle acts to retract the mandible or pull the chin back?
temporalis
What muscles act during the action of grinding on the temporomandibular joint?
- ipsilateral temporalis
- contralateral medial pterygoid
- contralateral lateral pterygoid
- both masseters
