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Week 8: TMJ Biomechanics
Terms in this set (21)
What is the main function of the TMJ joint? What is it also used for?
mastication! swallowing, speech, yawning, singing etc.
What articulates with what in the structure of the TMJ?
mandibular fossa of temporal bone articulates with mandibular condyle
The mandibular fossa has two parts, the ____ which is ____ and the ____ which is ____.
dome, concave, articular eminence, flat
The mandibular condyle is considered ____.
Both portions of the TMJ (the ____ and the _____) are covered in ____.
mandibular fossa, mandibular condyle, fibrocartilage
The articular disc of the TMJ is made up of dense ____, it is considered ____ and ____ and has decent ___ and ____.
fibrocartilage, avascular, aneural, tensile strength, shock absorption
The articular disc posteriorly attaches to the ____ and anteriorly attaches to:
retrodiscal lamina, neck of mandible, anterior capsule of TMJ, temporal bone (ant. to articular eminence), and sup head of lat. pterygoid
The retrodiscal lamina attaches to both the _____ inferiorly and the _____ superiorly.
mandible, temporal bone
What are the three general functions of the articular disc?
1. divide the TMJ into 2 separate joint spaces
2. maximizes congruity to reduce joint contact pressure
3. stabilize the joint
The fibrous joint capsule of the TMJ provides _____ and ____ support and is relatively lax ____ and ____.
medial, lateral, anteriorly, posteriorly
The primarily ligament of the TMJ is the _____ ligament that has ______ fibers and ____ fibers.
lateral TMJ, superficial oblique, deep horizontal
The superficial oblique fibers of the lateral TMJ ligament go from the ____ to the ____ and ____.
posterior neck of mandible, articular eminence, zygomatic arch
The superficial oblique fibers of the lateral TMJ ligament limit ___ phase of ____ and initiates ___ phase of _____.
early, mouth opening, late, mouth opening
The deep horizontal fibers of the lateral TMJ ligament go from the _____ and ____ to the _____.
articular eminence, zygomatic arch, lateral mandibular condyle
During depression the _____ is highly active and the ___ are highly active.
inferior head of lateral pterygoid, suprahyoids
During elevation the ____, ____ and ____ are highly active while the ____ acts eccentrically to keep the disc on the condyle.
masseter, medial pterygoid, temporalis, superior head of lateral pterygoid
During lateral excursion to the left, the ________ are highly active while the _____ and ____ are slightly active.
contralateral lateral/medial pterygoid, ipsilateral temporalis, masseter
____ with ____ places tension on the infrahyoid muscles.
lower cervical flexion, upper cervical extension
_____, _____ and or ______ puts tension on the omohyoid muscles (since they attach to the ____).
scapular abduction, depression, scapular downward rotation, scapula
The resulting forces on the mandible is ____ and ____ causing chronic compression of the ____ and chronic spasm on the ____.
depression, retrusion, retrodiscal lamina, lateral pterygoid
The chronic spasm of the lateral pterygoid will overcome the _____ ligament and may contribute to _____ articular disc ____.
lateral TMJ, medial/anterior, subluxation
THIS SET IS OFTEN IN FOLDERS WITH...
Week 1: Intro to Biomechanics
Week 2: Joint/Muscle Structure and Function
Week 3: Cervical Spine Biomechanics
Week 4: Shoulder Complex Passive
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