TMJ Flashcards
Mastication is an interaction between these three things
CNS
Tongue
TMJ muscles
What type of joint is the TMJ?
Synovial
Articulation surfaces of the TMJ are covered in ____________.
Fibrocartilage
Function of the retrodiscal laminae
Connective tissue that anchors the articular disc to bone.
The OUTER/INNER portion of the articular disc is innervated
Outer
Attachments of the articular disc (anterior and posterior)
Anterior attachment: lateral pterygoid
Posterior attachment: retrodiscal laminae
Two functions of the articular disc
Maximize congruency
Shock absorption
During the early phase of mandible ROM (35-50%), motion comes from _________ of the condyle.
rolling/rotation
During the late phase of mandible ROM (50-65%), motion comes from ___________ of both the condyle and the disc.
Anterior glide
Identify two closed packed positions of the TMJ.
maximum mouth open (ligamentous closed packed)
Maximum mouth closed (bony closed packed)
Identify 4 main muscles of mastication
Temporalis
Masseter
Medial pterygoid
Lateral Pterygoid
Identify the two groups of secondary muscles of mastication
Suprahyoid muscles
Infrahyoid muscles
How do the suprahyoid muscles assist mastication?
Mandible depression (with hyoid stabilized)
How do the Infrahyoid muscles assist mastication?
Stabilize hyoid bone for suprahyoids to depress mandible.
Protrusion is handled mainly by this muscle
Lateral pterygoid
