TMJ

Question 1

TMJ Innervation

Answer 1

Trigeminal (V3) mandibular division

Question 2

Temporomandibular Joint

Answer 2

joint that allows movement of the mandible for speech and mastication. Temporal bone articulates with mandibular condyles on both sides

Question 3

Temporal Bone Landmarks

Answer 3

Articular Eminence, Articular Fossa, Postglenoid Process

Question 4

Articular Eminence

Answer 4

smooth, rounded ridge, anterior to Articular Fossa *subluxation/lock-jaw

Question 5

Articular Fossa

Answer 5

oval-shaped depression, medial to zygomatic process

Question 6

Postglenoid Process

Answer 6

sharper ridge, posterior to Articular Fossa

Question 7

Joint Capsule

Answer 7

fibrous capsule that completely encloses TMJ

Question 8

Joint Disk

Answer 8

between temporal bone and mandibular condyle. *divides TMJ into Upper + Lower Synovial Cavities

Question 9

Synovial Fluid

Answer 9

secreted from membranes inside capsule. *lubricates joints, fills cavities

Question 10

TMJ Ligaments

Answer 10

Temporomandibular, Stylomandibular, Sphenomandibular

Question 11

Temporomandibular Ligament

Answer 11

zygomatic process to posterior condyle neck. *reinforces, prevents extension

Question 12

Stylomandibular Ligament

Answer 12

medial surface from styloid process to angle. *becomes taut during protrusion

Question 13

Sphenomandibular Ligament

Answer 13

spine of sphenoid to lingual of mandible. *taut during protrusion

Question 14

Jaw Movements

Answer 14

gliding [forward + backward] | rotational [depression + evevation]

Question 15

Protrusion muscle

Answer 15

lateral pterygoid

Question 16

Retraction muscle

Answer 16

temporalis

Question 17

Depressing the jaw requires which muscles?

Answer 17

Lateral pterygoid and anterior suprahyoid

Question 18

Contralateral Lateral Pterygoid

Answer 18

*lateral deviation of mandible, occurs during mastication - one on each side L+R

Question 19

Power Stroke

Answer 19

when teeth crunch food

Question 20

Food on one side …

Answer 20

all opposite side closing jaw muscles contract.

Question 21

Interoccusal clearance

Answer 21

resting position of the TMJ = 2-4mm between opposing arches.

Question 22

Temporomandibular Disorder

Answer 22

[TMD] tenderness, swelling, pain, spasms. most symptoms originate from surrounding muscles. palpate to diagnose.

Question 23

Subluxation

Answer 23

dislocation of both joints; *head of condyles moves too far anterior on articular eminence.

Question 24

Trismus

Answer 24

inability to normally open the mouth; symptom of TMD + subluxation