TMJ

Question 1

what is the TMJ made up of?

Answer 1

the mandibular fossa of the temporal bone superiorly articulating with the condyle of the mandible inferiorly.

Question 2

what kind of joint is the TMJ?

Answer 2

synovial joint best described as a modified hing shape because it allows some gliding motion as well as being a hinge joint.

Question 3

what are the joint motions of TMJ?

Answer 3

mandibular depression
mandibular elevation
mandibular lateral deviation
mandibular protrusion
mandibular retrusion

Question 4

when the mandible is at rest…

Answer 4

the condyle of the mandible is seated in the mandibular fossa of the temporal bone

Question 5

describe the upper/lower joint space of the articular disk

Answer 5

the superior surface is both concave and convex to accommodate the shape of the fossa. the concave inferior surface of the articular disk accommodates the convex surface of the condyle and allows the joint to remain congruent throughout the motion

Question 6

the mandible articulates with what bone?

Answer 6

the temporal bone

Question 7

what are the important landmarks of the mandible

Answer 7

angle,body,condyle,coronoid process, mental spine,neck,notch,ramus

Question 8

the coronoid process serves as an attachment for what muscle?

Answer 8

masseter muscle

Question 9

the mental spine serves as an attachment for what muscle?

Answer 9

geniohyoid muscle

Question 10

important landmarks of the temporal bone

Answer 10

articular tubercle, mandibular fossa, postglenoid tubercle, styloid process, mastoid process, external auditory meatus, zygomatic process.

Question 11

the mandibular fossa articulates with what?

Answer 11

the condyle of the mandible

Question 12

what attaches to the mastoid process?

Answer 12

the digastric muscle

Question 13

the zygomatic process serves as an attachment for what muscle?

Answer 13

the masseter muscle

Question 14

important landmarks of the sphenoid bone

Answer 14

greater wing, lateral pterygoid plate, spine

Question 15

the greater wing provides attachment for what muscles?

Answer 15

temporalis and lateral pterygoid muscles

Question 16

the lateral pterygoid plate serves as an attachment for what muscles?

Answer 16

lateral and medial pterygoid muscles.

Question 17

the spine provides attachment for what ligament?

Answer 17

sphenomandibular ligament

Question 18

important landmarks of the zygomatic bone

Answer 18

temporal process, temporal fossa, zygomatic arch

Question 19

the temporal fossa includes portions of what bones?

Answer 19

zygomatic, frontal, parietal, sphenoid, and temporal bones

Question 20

zygomatic arch is formed by what 2 bones?

Answer 20

zygomatic process of temporal bone posteriorly and temporal process of the zygomatic bone anteriorly

Question 21

mandible and maxilla are?

Answer 21

the lower jaw and upper jaw

Question 22

important landmark of the maxilla

Answer 22

tuberosity

Question 23

tuberosity serves as an attachment for?

Answer 23

the medial pterygoid

Question 24

hyoid bone has what kind of bony articulation?

Answer 24

none

Question 25

the hyoid bone is suspended from?

Answer 25

the styloid processes of the temporal bones by the stylohyoid ligaments.

Question 26

main function of hyoid bone?

Answer 26

provide attachment for the tongue muscle, also provides attachment for the suprahyoid and infrahyoid muscles that assist in mandibular depression.

Question 27

thyroid cartilage provides attachment for what muscle?

Answer 27

the infrahyoid muscles

Question 28

lateral ligament (temporomandibular ligament) limits?

Answer 28

downward, posterior, and lateral motions of the mandible

Question 29

sphenomandibular ligament

Answer 29

suspends the mandible and limits excessive anterior motion

Question 30

stylomandibular ligament

Answer 30

limits excessive anterior motion

Question 31

stylohyoid ligament

Answer 31

hold the hyoid bone in place

Question 32

depression of the mandible involves what 2 motions?

Answer 32

occurs in lower joint space - the mandibular condyle rotates on the disk creating an anterior glide of the condyle while the distal end (ramus/angle) moves posteriorly. the 2nd part occurs in the upper joint space - gliding the disk forward and downward under teh articular tubercle

Question 33

suprahyoid muscles

Answer 33

mylohyoid, geniohyoid, stylohyoid, digastric

Question 34

infrahyoid muscles

Answer 34

sternohyoid, sternothyroid, thyrohyoid, omohyoid