tmj

Question 1

two features of temporal bone that are part of tmj

Answer 1

• articular tubercle

- mandibular fossa

Question 2

anterior border of tmj

Answer 2

articular tubercle

Question 3

posterior border of tmj

Answer 3

squamo and petrotympanic fissures

Question 4

medial border of tmj

Answer 4

spine of sphenoid bone

Question 5

lateral border of tmj

Answer 5

zygomatic process of temporal bone

Question 6

neck of condylar process has

Answer 6

pterygoid fovea (attachment of lateral pterygoid m)

Question 7

medio-lateral length of condyle

Answer 7

13 to 25 mm

Question 8

articular capsule - anterior attachment

Answer 8

anterior margin of articular tubercle

Question 9

articular capsule - lateral and medial attachment

Answer 9

margins of mandibular fossa

Question 10

articular capsule - posterior attachment

Answer 10

squamo and petrotympanic fissure

Question 11

articular capsule - inferior attachment

Answer 11

upper part of condylar neck

Question 12

lateral ligament prevents

Answer 12

posterior and inferior displacement of tmj

Question 13

sphenomandibular ligament runs from

Answer 13

spine of sphenoid bone to lingula of mandible

Question 14

function of sphenomandibular and stylomandibular ligament

Answer 14

stabilize mandible to skull

Question 15

stylomandibular ligament runs from

Answer 15

styloid process to angle of mandible

Question 16

anterior attachment of articular disc

Answer 16

lamellae blend with anterior capsule

Question 17

posterior attachment of articular disc

Answer 17

superior lamella: squamo and petro tympanic fissure

inferior lamella: fuse with periosteum of condylar neck

Question 18

depression of mandible

Answer 18

• rotation (20-27mm opening) and translation (46-56 mm)

- condyle moves down and forward

Question 19

maximal opening

Answer 19

condyles rest on articular eminence

Question 20

elevation of mandible

Answer 20

-condyle moves back and up

Question 21

protrusion of mandible

Answer 21

condyles move anteriorly and inferiorly along articular eminence

Question 22

retrusion

Answer 22

• temporalis (post) and masseter (deep)

- condyle moves up and back on eminence

Question 23

lateral movement

Answer 23

condyle shifts medially (slightly) and rotates (rotation)

-on other side: condyle moves down and forward (translation)

Question 24

upper joint space is responsible for what type of movement

Answer 24

translation (protrusion and retraction)

Question 25

lower joint space is responsible for what type of movement

Answer 25

hinge

-opening and closing

Question 26

innervation of tmj

Answer 26

1. articular branch of auriculotemporal n
2. deep temporal n
3. masseteric n

Question 27

blood supply of tmj

Answer 27

• articular branch of transverse facial a
• deep auricular a
• masseteric a