Tmj

Front 1

What type of joint is the TMJ?

Back 1

Ginglymoarthrodial joint

Dual compartment structure and function
Both a hinge and sliding joint

Front 2

What is the innervation of TMJ?

Back 2

Auriculotemporal nerve from V3

C and A delta fibers

Front 3

In protrusion, how does the TMJ and associated muscles work?

Back 3

The lateral pterygoid muscles, the mandibular condyles and disks slide forward down under the articular eminence to position the mandible anteriorly

Front 4

In retrusion, how does the TMJ and associated muscles work?

Back 4

Mandible moves backwards when the posterior fibers of temporalis are pulled simultaneously and are assisted by the infra and suprahyoid muscles

Front 5

Upper compartment of TMJ

Back 5

Permits translational movement

Front 6

Lower compartment of TMJ

Back 6

Permits rotational movement

Front 7

Movement of opening

Back 7

Rotation occurs first, then translation

Front 8

Describe the jaw movement and associated muscles during lateral movement

Back 8

Both condyles do not move equally
When the mandible moves to the (right), the (right) condyle rotates but remains relatively stationary, while the (left) condyle and disk move forward, downward, and medially within the articular fossa

Front 9

What are the strokes involved in the chewing cycle?

Back 9

Closing stroke/prepatory stroke
Power stroke-time when food breakdown occurs
Opening stroke/recovery stroke

Front 10

What are the muscles involved in closing the jaw?

Back 10

Temporalis
Masseter
Medial Pterygoid

Front 11

What are the muscles involved in opening the jaw?

Back 11

Lateral pterygoid
Genohyoid
Mylohyoid-maybe
Digastric-maybe