Temporomandibular Joint - Ch. 5

Front 1

Tempormandibular Joint

Back 1

Joint on each side of the head that allows for movement of the mandible for speech and mastication.

Front 2

Bones of the TMJ

Back 2

Has two sets of articulation: Two temporal bones and two condyles of the mandible.

Both joints are covered by fibrocartilage.

Front 3

Temporal Bone

Back 3

Cranial bone that articulates with the mandible at the TMJ.

Front 4

Articular Eminence

Back 4

Positioned anterior to the articular fossa and consists of a smooth, rounded ridge.

Front 5

Articular Fossa

Back 5

AKA Mandibular Fossa
Posterior to the articular eminence and consists of a depression on the temporal bone.

Posterior and medial to the zygomatic process of the temporal bone.

Front 6

Mandible

Back 6

Facial bone that articulates with the temporal bone at the head of the condyle of the mandible, with its articulating surface of the condyle.

Front 7

Coronoid Process

Back 7

Anterior to the the condyle of the mandible

Front 8

Mandibular Notch

Back 8

Depression which is located between the condyle and coronoid process of the mandible

Front 9

Joint Capsule

Back 9

Fibrous
Completely encloses the temporomandibular joint.
Superior...wraps around the margin of the temporal bone's articular eminence and articular fossa
Inferiorly...wraps around the circumference of the mandibular condyle including the condyle's neck.

Front 10

Disc of the Joint

Back 10

Fibrous
Meniscus of the joint is located between the temporal bone and the condyle of the mandible on each side.
Superior aspect...
concavoconvex from anterior to posterior.
Inferior aspect... concave

Completely divides the TMJ into two compartment or spaces.

Front 11

Synovial Cavities

Back 11

Upper synovial cavity and a lower synovial cavity. Two compartments are divided by the disc of the joint.

Front 12

Synovial Fluid

Back 12

Secreted by the membrane lining on the inside of the joint capsule which helps lubricate the joint and fills the synovial cavities.

Clear, viscous liquid.

Front 13

Ligament

Back 13

Band of fibrous tissues that connects bone.

Three paired ______ are assoicated with the TMJ: TMJ?, Sphenomandibular?, and Stylomandiublar?

Front 14

TMJ Ligament

Back 14

Located on the lateral side of each joint and forms a reinforcement of the capsule of the TMJ.

Prevents the excessive retraction or moving backward of the mandible.

Front 15

Sphenomandibular Ligament

Back 15

Located on the medial side of the mandible.

Runs from the angular spine of the sphenoid bone to the lingula of the mandibular foramen.

N - Inferior alveolar nerve descends between the ________ and the ramus of the mandible to gain access to the mandibular foramen.

Landmark for the administration of inferior alveolar local anesthetic block.

Front 16

Protrusion of the mandible

Back 16

Bringing the lower jaw forward.
Involves the bilateral contraction of the lateraly pterygoid muscles.

Front 17

Retraction of the mandible

Back 17

Bringing the lower jaw backwards.
Involves the posterior portions of both temporalis muscles and bilateral contraction.

Front 18

Depression of the mandible

Back 18

Lowering of the jaw.
Gliding in both upper synovial cavities and rotation in both lower synovial cavities. Associated muscles: Suprahyoids and inferior heads of lateral pterygoid.
Bilateral contraction

Front 19

Elevation of the mandible

Back 19

Raising of the lower jaw.
Involves the rotational movement of the TMJ between the disc and the condyle of the mandible in the lower synovial cavity.

Front 20

Lateral Deviation

Back 20

Shifting the lower jaw to one side.
Involves both the gliding and rotational movements of the opposite TMJ's in their joint cavities.
Lateral pterygoid, unilateral contraction.