Q3-TMJ

Question 1

What do ginglymoid and arthodial mean in terms of the TMJ

Answer 1

ginglymoid - hinge

arthodial - glide

Question 2

The TMJ contains what three components

Answer 2

mandibular condyle
articular (glenoid) fossa and eminence
articular disc

Question 3

What is the name of the fossa that the TMJ is located in

Answer 3

temporal fossa

Question 4

What is the name of the fossa that lies deep to TMJ and can be seen after the zygomatic arch is removed

Answer 4

infratemporal fossa

Question 5

What nerve lies deep to the infra temporal fossa in the pterygomaxillary suture

Answer 5

maxillary nerve

Question 6

The mandible condyle has a greater (mediolateral or anteroposterior) dimension

Answer 6

mediolateral

Question 7

The articular fossa is the (nonfunctioning/functioning) portion

Answer 7

nonfunctioning

Question 8

The articular eminence is the (nonfunctioning/functioning) portion

Answer 8

functioning

Question 9

The articular disc is made up of what?

Answer 9

fibrous connective tissue

Question 10

True or False

The articular disc is not vascularized

Answer 10

False; the articular disc is highly vascularized everywhere but the center

Question 11

True or False

The ligaments of TMJ assist in moving the joint

Answer 11

False; they do not move the joint, they offer support and limit movement

Question 12

What are the 4 ligaments of the TMJ

Answer 12

fibrous capsule (capsular ligament)
lateral ligament
stylomandibular ligament
sphenomandibular ligament

Question 13

The synovial membrane is located within which ligament

Answer 13

fibrous capsule; it produces synovial fluid

Question 14

Which ligament is likened to a shower curtain surrounding the condyle and mandibular fossa

Answer 14

fibrous capsule (capsular ligament)

Question 15

This ligament prevents excessive rotation and opening

Answer 15

lateral ligament

Question 16

This ligament has two sets of fibers; OOP (outer oblique portion) and IHP (inner horizontal portion)

Answer 16

lateral ligament

OOP limits lateral rotation and gliding

Question 17

This ligament prevents excessive protrusion

Answer 17

stylomandibular ligament

Question 18

This ligament prevents excessive opening

Answer 18

sphenomandibular ligament

Question 19

What are the four muscles involved in mastication

Answer 19

temporalis
masseter
medial pterygoid
lateral pterygoid

Question 20

This muscle originates at the zygomatic arch (inf. and medial) and inserts on the lateral surface of rami and angle of the mandible

Answer 20

masseter

Question 21

This is the strongest muscle of mastication

Answer 21

masseter

Question 22

This muscle elevates and retrudes the mandible

Answer 22

temporalis

Question 23

This muscle elevates (closes) the mandible

Answer 23

masseter

Question 24

This muscle originates in the temporal fossa and inserts on the coronoid process, anterior border of ramus, and the temporal crest

Answer 24

temporalis

Question 25

This muscle works to elevate the mandible and close the teeth together

Answer 25

medial pterygoid

Question 26

This muscle originates at the pterygoid fossa and inserts on the medial angle of the mandible

Answer 26

medial pterygoid

Question 27

This muscle moves the mandible laterally and paired with the other, protrudes and depresses the mandible

Answer 27

lateral pterygoid

Question 28

This muscle originates on the lateral pterygoid plate and greater wing and inserts on the pterygoid fovea and anterior part of the articular disc

Answer 28

lateral pterygoid

Question 29

What other muscles assist the lateral pterygoid in depressing the mandible?

Answer 29

suprahyoids (geniohyoid, mylohyoid, digastrics) | intrahyoids (omohyoid, sternohyoid)

Question 30

These muscles elevate the hyoid which contributes to swallowing

Answer 30

digastrics

Question 31

What other factors affect position and movement of the mandible besides the muscles of mastication (3)

Answer 31

ligaments fascia muscles of facial expression

Question 32

These muscle(s) control retrusion of the mandible

Answer 32

temporalis | suprahyoids

Question 33

These muscle(s) control depression of the mandible

Answer 33

both lateral pterygoids | supra- and infra-hyoids

Question 34

These muscle(s) control elevation of the mandible

Answer 34

masseter medial pterygoids temporalis (anterior, vertical, and middle fibers)

Question 35

These muscle(s) control protrusion of the mandible

Answer 35

both lateral pterygoids masseter medial pterygoid

Question 36

These muscle(s) control lateral excursion of the mandible

Answer 36

right lateral pterygoid moves mandible left and vice versa

Question 37

What nerve innervate the muscles of mastication

Answer 37

mandibular branch of CN V

Question 38

What nerve(s) innervate the TMJ

Answer 38

auriculotemporal masseteric deep temporal

Question 39

What arteries irrigate the TMJ

Answer 39

superficial temporal middle meningeal internal maxillary

Question 40

True or False | The ligaments can stretch

Answer 40

False; the ligaments CANNOT stretch; if too much force is applied they elongate and will not be able to return to normal is elongated for too long of a time

Question 41

True or False | The articular surfaces of the TMJ must be maintained in contact (via capsular ligaments and elevator muscles)

Answer 41

True