Muscles of the Scalp

Question 1

What is the origin of the Occipitalis ?

Answer 1

superior nuchal line of the occipital bone and the mastoid process of the temporal bone

Question 2

What is the insertion of the occipitalis?

Answer 2

galea aponeruotica

Question 3

What nerve innervates the occipitalis?

Answer 3

Facial (CNVII)

Question 4

What is the origin of the Frontalis?

Answer 4

Galea Aponeruotica

Question 5

What is the insertion of the Frontalis?

Answer 5

Fascia and skin superior to the eye and nose

Question 6

What nerve innervates the frontalis?

Answer 6

Facial (CNVII)

Question 7

What are the actions of the occipitofrontalis?

Answer 7

raising the eyebrows

draws scalp posteriorly or anteriorly

Question 8

What is the origin of the masseter?

Answer 8

zygomatic arch

Question 9

What is the insertion of the masseter

Answer 9

angle and ramus of the mandible

Question 10

What are the actions of the masseter

Answer 10

elevation of mandible @ TMJ

protraction of mandible @ TMJ

Question 11

What nerve innervates the masseter

Answer 11

trigeminal nerve (CNV)

Question 12

What is the origin of the temporalis

Answer 12

temporal fossa

Question 13

What is the insertion of the temporalis

Answer 13

coronoid process and anterior border of ramus of the mandible

Question 14

What are the actions of the temporalis

Answer 14

elevates the mandible @ tmj

retracts the mandible @ TMJ

Question 15

What is the origin of the zygomatiucus major

Answer 15

zygomatic bone

Question 16

What is the insertion of the zygomaticus major

Answer 16

angle of the the mouth

Question 17

What are the actions of the zygomaticus major

Answer 17

elevates the angle of the mouth

Question 18

What is the origin of the risorius

Answer 18

fascia over the parotid gland

Question 19

What is the insertion of the risorius

Answer 19

angle of the mouth

Question 20

What are the actions of the risorius

Answer 20

draws laterally the angle of the mouth

Question 21

what nerve innervates the risorius

Answer 21

Facial nerce (CNVII)

Question 22

What nerve innervates the zygomaticus major

Answer 22

Facial nerve CNVII

Question 23

What is the origin of the buccinator

Answer 23

maxilla and mandible (alveolar processes)

Question 24

What is the insertion of the buccinator

Answer 24

lips

Question 25

What are the actions of the buccinator

Answer 25

compresses the cheeks

Question 26

What nerve innervates the buccinator

Answer 26

facial nerve CNVII

Question 27

What is the origin of the platysma

Answer 27

subcutaneous fascia of the superior chest

Question 28

What is the insertion of the platysma

Answer 28

mandible and the subcutaneous fascia of the lower face

Question 29

What are the actions of the platysma

Answer 29

draws the skin of the superior chest and neck creating ridges of skin in the neck

depresses and pulls lower lip laterally

Question 30

What nerve innervates the platysma

Answer 30

facial nerce CNVII

Question 31

What is the origin of the SCM

Answer 31

manubrium of the sternum and medial 1/3 of clavicle

Question 32

What is the insertion of the SCM

Answer 32

mastoid process of temporal bone and lateral 1/2 of the superior nuchal line of occipital bone

Question 33

What are the actions of the SCM

Answer 33

Lat flex of neck @ spinal joints
Lat flex of head @atlantooccipital 
contralateral rotation of head @ atlantoaxial
contralateral rotation of neck @ spinal 
flex of neck @ spinal 
Ex of neck @ spinal 
ex of head @ atlantooccipital
elevation of sternum and clavicle during forced inhalation

Question 34

What nerve innervates the SCM

Answer 34

spinal accessory nerve CNXI