Chapter 14 - TMJ

Question 1

Zygomatic bones

Answer 1

forms the prominence of the cheek and contributes the lateral wall and floor of the eye orbit

Question 2

Maxillary bone

Answer 2

upper jaw, located in the middle part of the face and houses the upper teeth

Question 3

Hyoid bone

Answer 3

horseshoe-shaped bone lying just superior to the thyroid cartilage at about the level of C3

Question 4

Thyroid cartilage

Answer 4

largest of the bibe cartilages of the larynx

Question 5

Lateral ligament or temporal mandibular ligament

Answer 5

Anteriorly, it attaches to the neck of the mandibular condyle and disk and then runs superiorly to the articular tubercle of the temporal bone

Question 6

Sphenomandibular ligament

Answer 6

attaches to the spine of the sphenoid bone and runs to the middle of the ramus on the internal surface of the mandible
- suspends the mandible and limits excessive anterior motion

Question 7

Stylodmandibular ligament

Answer 7

runs from the styloid process of the temporal bone to the posterior inferior border of the mandible’s ramus
- lies in between the masseter and medial pterygoid muscles and plays a role in limiting excessive anterior motion

Question 8

Articular disk of the TMJ

Answer 8

similar to the articular disk of the sternoclavicular joint
- connected circumferentially to the capsule and tendon of the lateral pterygoid

Question 9

Temporalis origin

Answer 9

temporal fossa

Question 10

Temporalis insertion

Answer 10

coronoid process and ramus of mandible

Question 11

Temporalis action - bilaterally

Answer 11

elevation, retrusion (posterior fibers)

Question 12

Temporalis action - unilaterally

Answer 12

ipsilateral lateral deviation

Question 13

Masseter origin

Answer 13

zygomatic arch of temporal bone and zygomatic process of axilla

Question 14

Masseter insertion

Answer 14

angle of the ramus and coronoid process of mandible

Question 15

Masseter action - bilaterally

Answer 15

elevation

Question 16

Masseter action - unilaterally

Answer 16

ipsilateral lateral deviation

Question 17

Masseter nerve

Answer 17

mandibular branch of trigeminal nerve (cranial nerve V)

Question 18

Medial pterygoid origin

Answer 18

lateral pterygoid plate of the sphenoid bone and tuberosity of the maxilla

Question 19

Medial pterygoid insertion

Answer 19

ramus and angle of the mandible

Question 20

Medial pterygoid action - bilaterally

Answer 20

elevation, protrusion

Question 21

Medial pterygoid action - unilaterally

Answer 21

contralateral lateral deviation

Question 22

Medial pterygoid nerve

Answer 22

mandibular brach of trigeminal nerve (crainal nerve V)

Question 23

Lateral pterygoid origin

Answer 23

lateral pterygoid plate and greater wing of the sphenoid

Question 24

Lateral pterygoid insertion

Answer 24

mandibular condyle and articular disk

Question 25

Lateral pterygoid action - bilaterally

Answer 25

depression, protrusion

Question 26

Lateral pterygoid action - unilaterally

Answer 26

contralateral lateral deviation

Question 27

Lateral pterygoid nerve

Answer 27

mandibular branch of trigeminal nerve (cranial nerve V)

Question 28

Mylohyoid origin

Answer 28

interior medial mandible

Question 29

Mylohyoid insertion

Answer 29

hyoid

Question 30

Mylohyoid action

Answer 30

assists in depressing mandible

Question 31

Mylohyoid nerve

Answer 31

branch of trigeminal nerve (cranial nerve V)

Question 32

Geniohyoid origin

Answer 32

mental spine of mandible

Question 33

Geniohyoid insertion

Answer 33

hyoid

Question 34

Geniohyoid action

Answer 34

assist in depressing mandible

Question 35

Geniohyoid nerve

Answer 35

C1 via hypoglossal nerve (cranial nerve Xll)

Question 36

Stylohyoid origin

Answer 36

styloid process of temporal bone

Question 37

Stylohyoid insertion

Answer 37

hyoid

Question 38

Stylohyoid action

Answer 38

assists in depressing mandible

Question 39

Stylohyoid nerve

Answer 39

branch of facial nerve (cranial nerve Vll)

Question 40

Digastric origin - anterior

Answer 40

internal inferior mandible

Question 41

Digastric origin - posterior

Answer 41

mastoid process

Question 42

Digastric insertion

Answer 42

via pulleylike tendon to hyoid

Question 43

Digastric action

Answer 43

assists in depressing mandible

Question 44

Digastric nerve

Answer 44

mandibular branch of trigeminal nerve (cranial nerve V) and branch of facial nerve (cranial nerve Vll)

Question 45

Sternohyoid origin

Answer 45

medial end of clavicle, sternoclavicular ligament, and manubrium of sternum

Question 46

Sternohyoid insertion

Answer 46

inferior border of hyoid bone

Question 47

Sternohyoid action

Answer 47

stabilize hyoid bone

Question 48

Sternohyoid nerve

Answer 48

C1 to C3 via hypoglossal nerve (cranial nerve Xll)

Question 49

Sternothryoid orign

Answer 49

manubrium of sternum and cartilage of the first rib

Question 50

Sternothryoid insertion

Answer 50

thyroid cartilage

Question 51

Sternothryoid action

Answer 51

stabilize hyoid bone

Question 52

Sternothryoid nerve

Answer 52

C1 to C3 via hypoglossal nerve (cranial nerve Xll)

Question 53

Thyrohyroid origin

Answer 53

thryoid cartilage

Question 54

Thyrohyroid insertion

Answer 54

inferior border of hyoid bone

Question 55

Thyrohyroid action

Answer 55

stabilize hyoid bone

Question 56

Omohyoid origin

Answer 56

superior border of the scaoula

Question 57

Omohyoid insertion

Answer 57

inferior border of hyoid bone

Question 58

Omohyoid action

Answer 58

stabilize hyoid bone