Muscles of the Head

Question 1

Platysma

Origin, Insertion, Action, Nerve Supply

Answer 1

O: median raphe of neck
I: upper and lower lips
A: retracts commissure of mouth
NS: buccal, caudal auricular br. of CN VII

Question 2

Frontalis

Origin, Insertion, Action, Nerve Supply

Answer 2

O: scutiform cartilage
I: upper eyelid
A: pulls scutulum forward
NS: rostral auricular branch of CN VII

Question 3

Retractor Anguli Oculi Lateralis

Origin, Insertion, Action, Nerve Supply

Answer 3

O: deep temporal fascia
I: lateral angle of the eye
A: retracts lateral angle of the eye
NS: auriculopalpebral n. of CN VII

Question 4

Levator Anguli Oculi Medialis

Origin, Insertion, Action, Nerve Supply

Answer 4

O: frontal fascia
I: medial to upper eyelid
A: elevates medial part of the upper eyelid
NS: auriculopalpebral n. of CN VII

Question 5

Orbicularis Oculi

Origin, Insertion, Action, Nerve Supply

Answer 5

O: medial orbital ligament
I: upper and lower eyelids
A: brings eyelids together
NS: auriculopalpebral n. of CN VII

Question 6

Zygomaticus

Origin, Insertion, Action, Nerve Supply

Answer 6

O: scutiform cartilage
I: angle of the mouth
A: retracts the angle of mouth
NS: dorsal and ventral buccal br of CN VII

Question 7

Orbicularis Oris

Origin, Action, Nerve Supply

Answer 7

O: lies within the lips
A: closes the oral rima
NS: dorsal and ventral buccal br of CN VII

Question 8

Levator Nasolabialis

Origin, Insertion, Action, Nerve Supply

Answer 8

O: maxilla, close to the orbit
I: upper lip, lateral to naris
A: elevates the upper, dilates the naris
NS: auriculopalpebral n. of CN VII

Question 9

Buccinator

Origin, Insertion, Action, Nerve Supply

Answer 9

O: alveolar border of maxilla and mandible
I: lips and cheek
A: moves food from buccal vestible to oral cavity
NS: dorsal and ventral br of CN VII

Question 10

Levator Labii Superioris

Origin, Insertion, Action, Nerve Supply

Answer 10

O: rim of infraorbital foramen, lateral aspect
I: upper lip and lateral aspect of naris
A: elevation and retraction of upper lip and nasal plate
NS: dorsal and ventral buccal br of CN VII

Question 11

Caninus

Origin, Insertion, Action, Nerve Supply

Answer 11

O: rim of infraorbital foramen, ventral aspect
I: upper lip
A: retraction of upper lip
NS: dorsal and ventral buccal br of CN VII

Question 12

Temporalis

Origin, Insertion, Action, Nerve Supply

Answer 12

O: temporal fossa
I: coronoid process of the mandible
A: raises mandible for mastication
NS: mandibular n of CN V

Question 13

Masseter

Origin, Insertion, Action, Nerve Supply

Answer 13

O: zygomatic arch
I: masseteric fossa of the mandible
A: raises mandible for mastication
NS: mandibular n of CN V

Question 14

Medial Pterygoid

Origin, Insertion, Action, Nerve Supply

Answer 14

O: pterygopalatine fossa
I: angular process of the mandible
A: raises mandible for mastication
NS: mandibular n of CN V

Question 15

Lateral Pterygoid

Origin, Insertion, Action, Nerve Supply

Answer 15

O: pterygopalatine fossa
I: mandibular condyle
A: raises mandible for mastication
NS: mandibular n of CN V

Question 16

Digastricus

Origin, Insertion, Action, Nerve Supply

Answer 16

O: jugular process
I: ventral border of the mandible
A: opens mouth
NS: mandibular n of CN V, and CN VII