Nbde Dental Anatomy Tmj

Front 1

What are considered to be the accessory ligaments of the TMJ?
What is their function?

Back 1

Shenomandibular lig. and Stylomandibular Lig.
Limit excessive openings

Front 2

Where is the sphenomandibular ligament attached?

Back 2

Lingula of the Mand.

Front 3

Where soes the stylomandibular Ligament attach?

Back 3

Angle of the Mand.

Front 4

What ligament is most damaged when using an inferior alveolar nerve block?

Back 4

Sphenomandibular ligament

Front 5

Where does the Temporomandibular ligament run?

Back 5

From the articular eminence to the mandibular condyle

Front 6

What are the functions of the Temporomandibular ligament?

Back 6

Provides lateral reinforcement
Prevents post. and infer. displacement of condyle
Main Stabilizing Ligament

Front 7

What is another name for temporomandibular ligaments?

Back 7

Lateral ligament

Front 8

What is another name for collateral ligaments?

Back 8

Discal Ligaments

Front 9

Where does the collateral ligaments run?

Back 9

Arise from the periphery of the disc and are attached to the medial and lateral poles of the condyle.

Front 10

What is the function of the Collateral ligaments?

Back 10

Stabilize the disc on top of the condyle
Resist movements of disc away from condyle during function

Front 11

What are collateral ligaments made from?

Back 11

Collagenous connective tissue
Do Not Stretch

Front 12

which muscle will cause a deviation of the mand. when protruding to the side of the damage?

Back 12

Lateral Pterygoid

Front 13

What are the two parts of the lateral pterygoid?

Back 13

Superior belly and inferior belly

Front 14

Where does the inferior belly of the lateral pterygoid run?

Back 14

From lateral pterygoid plate to neck of condyle

Front 15

Where does the superior belly of the lateral pterygoid run?

Back 15

Greater wing of the sphenoid and infratemporal crest
Inserts on joint capsule articular disk and condyle of neck

Front 16

What is the function of the superior belly of the lateral pterygoid?

Back 16

Assist in stabilizing the position of the articular disk during closing

Front 17

What is the function of the masseter?

Back 17

Elevation of the mand. (Jaw closing)

Front 18

What is the function of the Temporalis?

Back 18

Elevation of mand. (Jaw closing)
Retraction of the mand. (lower jaw backward)

Front 19

What is the function of the medial pterygoid?

Back 19

Elevation of the mand. (Jaw closing)

Front 20

What is the function of the inferior heads of the lateral pterygoid?

Back 20

Slight depression of the mand. (jaw closing)

Front 21

What occurs with unilateral contraction of the lateral pterygoids?

Back 21

Lateral deviation of mand.

Front 22

what occurs with bilateral contraction of the lateral pterygoid muscles?

Back 22

Protrusion of the mand.

Front 23

Where do you test a patients temporomandibular joint tenderness and noise?

Back 23

Joint palpated laterally over the post. surface of the condyles with the mouth open

Front 24

True/False:
Condyles are not symmetrical nor identical

Back 24

True

Front 25

Dislocation of the TMJ is almost always ...

Back 25

Anteriorly and occurs while laughing or yawning

Front 26

What is dislocation also referred as?

Back 26

Open lock

Front 27

Hypermobility or hypertranslation of the mand.

Back 27

Subluxation

Front 28

What is the difference between Dislocation and subluxation?

Back 28

With subluxation patient can return the mand. to its normal position without assistance of the dentist

Front 29

Which component of the TMJ has the most vasculature and innervation?

Back 29

Retrodiscal tissue

Front 30

Composed of dense fibrous connective tissue, and it is positioned in between the condyle and the fossa, dividing the joint into superior and inferior spaces.

Back 30

Articular disc

Front 31

What is the middle part of the articular disk called?

Back 31

Thinner central intermediate zone

Front 32

Which band is the thicker of the two on the articular disk?
Anterior or posterior

Back 32

Posterior

Front 33

What kind of tissue is attached to the post. Articular disk?

Back 33

Retrodiscal tissue

Front 34

What kind of tissue is attached to the anterior band of the articular disk?

Back 34

Contiguous with the capsular ligament, the condyle, and the superior belly of lateral pterygoid muscle.

Front 35

What are the articular surfaces of the TMJ covered with?

Back 35

Dense fibrous connective tissue

Front 36

What does the layer of fibrocartilaginous tissue provide to the TMJ?

Back 36

Offers resistance against both compressive and lateral forces

Front 37

What is the shape of the Condyle?

Back 37

Eliptically shaped
long axis is oriented mediolaterally

Front 38

What test is considered to be the gold standard for providing an image of the soft tissue of the temporomandibular joint, esp. the position of the articular disc?

Back 38

MRI

Front 39

What is the major advantage of the MRI technique?

Back 39

No exposure of the patient to x-ray radiation

Front 40

what sound is made by the articular disc when displaced to the anterior of the condyle?

Back 40

Clicking

Front 41

What is a crepitation sound or a crepitus in the TMJ usually associated with?

Back 41

Degenerative process (osteoarthritis) of the condyle

Front 42

What is a dull thud in the TMJ usually associated with?

Back 42

Self-reducing subluxation of the condyle

Front 43

What is another term for ear ringing?

Back 43

Tinnitus

Front 44

If a patient has clicking in their TMJ where is this joint most likely to be displaced?

Back 44

Anteromedial

Front 45

What occurs during disc displacement of the TMJ?

Back 45

Collateral ligaments become elongated/torn
Allows lateral pterygoid to pull articular disc out of place

Front 46

What type of joint is the TMJ?

Back 46

Ginglymoarthroidal joint

Front 47

What type of movements does the TMJ allow?

Back 47

Hinge like rotation
Sliding

Front 48

What is considered to be the nonfunctioning portion of the TMJ?

Back 48

Articular fossa
(Ant 3/4 of large mand. fossa)

Front 49

What is considered to be the functional part of the TMJ?

Back 49

Articular eminence

Front 50

What is it that connects the mand. to the temporal bone?

Back 50

Combined hinge and gliding joint

Front 51

What is the only movable joint in the skull that has dense fibrous connective tissue on its articular surfaces?

Back 51

TMJ

Front 52

The vessel supplies the TMJ?

Back 52

Deep temporal and Masseteric of max. artery
Branches of superficial temporal from external carotid

Front 53

What is the venous drainage of the TMJ?

Back 53

Superficial temporal, maxillary, and pterygoid plexus

Front 54

What is the capsule of the TMJ innervated by?

Back 54

Auriculotemporal nerve (V3)

Front 55

What is the anterior region of the TMJ innervated by?

Back 55

Massetertic and deep temporal from V3; Sensory from V3

Front 56

What path do the nerve fibers that innervate the TMJ follow?

Back 56

Vessels of the blood supply; End as free nerve endings

Front 57

What parts of the TMJ are not innervated?

Back 57

Articular cartilage and central part of the articular disc.

Front 58

Are myelinated or unmyelinated nerves seen in the TMJ?

Back 58

Both

Front 59

What is the source of proprioception in the TMJ?

Back 59

Retiodiscal tissue

Front 60

What structure of the TMJ secretes the fluid that lubricates the TMJ?

Back 60

Inner synovial layer of fibrous capsule

Front 61

The fibrous capsule of the TMJ is fairly thin except where?

Back 61

Laterally where it forms the temporomandibular ligament (lateral)

Front 62

Where is the fibrous capsule of the TMJ firm?
Why?

Back 62

Medially and Laterally
Stabilize mand. during movement

Front 63

Where is the fibrous capsule of the TMJ loose?
Why?

Back 63

Anterior and Posterior
Allow mand. movement

Front 64

What are large amounts of synovial fluids an indication of in the TMJ?

Back 64

Painful internal derangements

Front 65

What is the purpose of the joint capsule and ligaments of the TMJ?

Back 65

Restrict excessive displacement of the mand.

Front 66

Thicker layer of fibrous tissue which is reinforced by accessory ligaments.

Back 66

Outer fibrous layer of the fibrous capsule of the TMJ

Front 67

Translatory movements take place in which compartment of the TMJ?

Back 67

Upper (mand. fossa - articular disc) compartment

Front 68

Rotary motions take place in which compartment of the TMJ?

Back 68

Lower (condyle - articular disc) compartment
Hinge-type