OIA of Head and Neck Muscles

Question 1

origin of masseter

Answer 1

• zygomatic arch
• zygomatic bone

Question 2

insertion of masseter

Answer 2

• angle and ramus of mandible

Question 3

origin of temporalis

Answer 3

• temporal fossa

Question 4

insertion of temporalis

Answer 4

• coronoid process of mandible (via a tendon deep to zygomatic arch)

Question 5

what muscles elevate the mandible?

Answer 5

masseter and temporalis

Question 6

origin of medial pterygoid

Answer 6

• medial surface of lateral pterygoid plate of sphenoid bone
• maxilla
• palatine bone

Question 7

insertion of medial pterygoid

Answer 7

• medial surface of mandible (near angle)

Question 8

origin of lateral pterygoid

Answer 8

• greater wing and lateral pterygoid plate of sphenoid bone

Question 9

insertion of lateral pterygoid

Answer 9

• condylar process of mandible
• capsule of temporomandibular joint

Question 10

origin of genioglossus

Answer 10

• internal surface of mandible near symphysis

Question 11

insertion of genioglossus

Answer 11

• inferior aspect of the tongue
• body of the hyoid bone

Question 12

origin of hyoglossus

Answer 12

• body of hyoid bone
• greater horn of hyoid bone

Question 13

insertion of hyoglossus

Answer 13

• inferolateral tongue

Question 14

origin of styloglossus

Answer 14

• styloid process of temporal bone

Question 15

insertion of syloglossus

Answer 15

• lateral inferior aspect of tongue

Question 16

origin of corrugator supercilli

Answer 16

• arch of frontal bone above nasal bone

Question 17

insertion of corrugator supercilli

Answer 17

• skin of eyebrow

Question 18

origin of orbicularis oculi

Answer 18

• frontal bone
• maxillary bone
• ligaments around orbit

Question 19

insertion of orbicularis oculi

Answer 19

• tissue of eyelid

Question 20

origin of zygomaticus

Answer 20

• zygomatic bone

Question 21

insertion of zygomaticus

Answer 21

• skin and muscle at corner of mouth

Question 22

origin of orbicularis oris

Answer 22

• indirectly from maxilla and mandible
• blended with facial muscles at lips

Question 23

insertion of orbicularis oris

Answer 23

• muscles and skin at angles of mouth

Question 24

origin of mentalis

Answer 24

• mandible below incisors

Question 25

insertion of mentalis

Answer 25

• skin of chin

Question 26

origin of platysma

Answer 26

• fascia of chest (over pec and deltoid)

Question 27

insertion of platysma

Answer 27

• lower margin of mandible
• skin and muscle at corner of mouth

Question 28

origin of risorius

Answer 28

• lateral fascia of masseter muscle

Question 29

insertion of risorius

Answer 29

• skin at angles of mouth

Question 30

origin of levator labii superioris

Answer 30

• zygomatic bone
• infraorbital margin of maxilla

Question 31

insertion of levator labii superioris

Answer 31

• skin and muscle of upper lip

Question 32

origin of depressor labii inferioris

Answer 32

• body of mandible lateral to its midline

Question 33

insertion of depressor labii inferioris

Answer 33

• skin and muscle of lower lip

Question 34

origin of depressor anguli oris

Answer 34

• body of mandible below incisors

Question 35

insertion of depressor anguli oris

Answer 35

• skin and muscle at angle of mouth (below zygomaticus insertion)

Question 36

origin of buccinator

Answer 36

• molar region of maxilla and mandible

Question 37

insertion of buccinator

Answer 37

• orbicularis oris

Question 38

origin of splenius

Answer 38

• ligamentum nuchae
• spinous processes of C7- T6

Question 39

insertion of splenius

Answer 39

• mastoid process of temporal and occipital bone
• transverse processes C2-C4

Question 40

origin of sternocleidomastoid

Answer 40

• manubrium of sternum and medial portion of clavicle

Question 41

insertion of sternocleidomastoid

Answer 41

• mastoid process of temporal bone
• superior nuchal line of occipital bone

Question 42

origin occipitofrontalis (epicranius)

Answer 42

Frontal belly (frontalis) = skin of eyebrow, muscles of forehead
Occipital belly (occipitalis) = lateral 2/3 of superior nuchal line

Question 43

insertion of occipitofrontalis (epicranius)

Answer 43

epicranial aponeurosis