TMJ-Exam III

Question 1

Is the articular eminence anterior or posterior in the TMJ?

Answer 1

The articular eminence is ANTERIOR to the mandibular fossa of the temporal bone

Question 2

Is the tympanic plate anterior or posterior in the TMJ?

Answer 2

The tympanic plate is the Posterior boarder of the TMJ

Question 3

What muscle attaches in the Pterygoid Fovea?

Answer 3

The Lateral Pterygoid

Question 4

What is the medial boarder of the TMJ?

Answer 4

The spine of the sphenoid

Question 5

What are the two fissures that make up the posterior portion of the TMJ? Hint: same fissure, but changes names

Answer 5

1. SquamoTympanic Fissure—-> 2. PterygoTympanic Fissure

Question 6

What is the sock (or shower curtain) like structure that attaches the joint from the temporal bone to the neck of the mandible?

Answer 6

The Capsule

Question 7

What are the superior (ant. & post) and inferior attachments of the capsule?

Answer 7

Superior Post: SquamoTympanic Fissure….. Superoir Anterior: Articular Eminence….Inferior: Neck of the Condyle

Question 8

What is the thick ligament that prevents Posterior and inferior displacement of the TMJ?

Answer 8

TemproMandibular Ligament (ITS Lateral)

Question 9

What are the two extrinsic ligaments that help stabilize the TMJ?

Answer 9

SphenoMandibular and StyloMandibular Ligaments

Question 10

If the articular disc of the TMJ is avascular, then how does it receive nutrients?

Answer 10

The synovial Fluid

Question 11

Is the TMJ load bearing?

Answer 11

Nope, the TMJ is non load bearing.

Question 12

Where does the posterior thickening of the articular disc sit at rest? Where does the anterior?

Answer 12

Posterior: Atop the Condyle Anterior: Below the articular eminence.

Question 13

How does the Articular Disc attach to the walls of the capsule?

Answer 13

Superior and Inferior Sheets/Lamellae

Question 14

What does the Aurticular Disc attach to anteriorly?

Answer 14

The fibers of the capsule, THEN the articular eminence and the condyle head SO it SPLITS

Question 15

What does the lamella of the articular disc attach to posteriorly? What space does it create?

Answer 15

ANOTHER SPLIT: The SquamoTympanic Fissue superiorly and the neck of the condyle inferiorly making the RetroDiscal Space

Question 16

Which capsule attachment is tight? Which capsule attachment is loose? Superior or Inferior?

Answer 16

Superior Attachment = Loose…..Inferior Attachment=Tight

Question 17

What moves during rotation?

Answer 17

Just the Condyles! Its very slight up to 27mm ( 1 inch) opening

Question 18

What moves during translation?

Answer 18

Sliding of the condyles AND the Articular Disc into the articular eminence (which causes the mandible to open)

Question 19

What three nerves provide general sensory to the TMJ? What are they all a branch of?

Answer 19

V3! AuriculoTemporal. Masseteric, Temporalis

Question 20

What are the two main blood supply sources?

Answer 20

Superficilal Temporal Artery and Maxillary Artery

Question 21

Since were talking about mastication again… What PROTRUDES the mandible?

Answer 21

Lateral Pterygoid, Medial Pterygoid, Superficial Head of Masseter

Question 22

What muscles Retrude the mandible?

Answer 22

Temporalis, Deep Masseter (from a protruded position)

Question 23

What muscles depress the mandible?

Answer 23

Inferior head of Lateral Pterygoid, Infra&SupraHyoid Muscles, Gravity

Question 24

What muscles elevate the jaw?

Answer 24

Masseter, Temporalis, Medial Pterygoid

Question 25

What muscles cause Right Lateral Excursion?

Answer 25

Right Masseter, Right Temporalis, Left Medial Pterygoid, Left Lateral Pterygoid THINK ABOUT ORIGINS AND INSERTIONS!!!

Question 26

What muscles cause Left Lateral Excursion?

Answer 26

Left Masseter, Left Temporalis, Right Lateral Pterygoid, Right Medial Pterygoid