Neck Muscles

Question 1

Function of Platysma

Answer 1

Tenses skin of inferior face/neck

Question 2

What nerve innervates the Platysma

Answer 2

Cranial Nerve VII - Facial Nerve

Question 3

Function of Trapezius

Answer 3

Shoulder elevation/depression. Retracts scapula. Rotates glenoid to face superiorly (helps us reach up)

Question 4

What innervates Trapezius

Answer 4

CN XI - Spinal Accessory

Question 5

Fxn of Sternocleidomastoid

Answer 5

Unilateral contraction: lateral flexion and rotation of head (causes to face up and away from muscle);

Bilateral contraction: extends head at neck and flexes neck to bring chin down towards chest

Question 6

What innervates Sternocleidomastoid

Answer 6

Spinal accessory nerve (CN XI)

Question 7

Fxn of Geniohyoid

Answer 7

Pulls hyoid anteriorly, shortens floor of mouth, widens pharynx

Question 8

Innervation of Geniohyoid

Answer 8

C1 ventral ramus via CN XII

Question 9

Fxn of Stylohyoid

Answer 9

Elevates/retracts hyoid, elongates floor of mouth

Question 10

Innervation of Stylohyoid

Answer 10

CN VII - Facial Nerve

Question 11

Fxn of Diagastric: Anterior and Posterior Belly

Answer 11

Elevates hyoid during swallowing/speaking, can also depress mandible

Question 12

Innervation of Diagastric: Anterior and Posterior Belly

Answer 12

Anterior: Inferior alveolar nerve

Posterior: CN VII - Facial Nerve

Question 13

Fxn Mylohyoid

Answer 13

Elevates hyoid, tongue, floor of mouth during swallowing/speech

Question 14

Innveration of Mylohyoid

Answer 14

Inferior alveolar nerve

Question 15

Fxn Hyoglossus

Answer 15

Depresses tongue

Question 16

Innervation Hyoglossus

Answer 16

CN XII - Hypoglossal Nerve

Question 17

Fxn Sternohyoid

Answer 17

Depresses hyoid after elevation from swallowing

Question 18

Innervation Sterohyoid

Answer 18

Ventral rami from C1-C3 via ansa cervicalis

Question 19

Fxn Omohyoid

Answer 19

Depresses/retracts hyoid

Question 20

Innervation Omohyoid

Answer 20

Ventral rami from C1-C3 via ansa cervicalis

Question 21

Fxn Sternothyroid

Answer 21

Depresses hyoid and larynx

Question 22

Innervation Sternothyroid

Answer 22

Ventral rami from C2-C3 via ansa cervicalis

Question 23

Fxn Thyrohyoid

Answer 23

Depresses hyoid, elevates larynx

Question 24

Innervation Thyrohyoid

Answer 24

Depresses hyoid, elevates larynx

Question 25

What muscles insert onto the Hyoid Bone?

Answer 25

Geniohyoid
Stylohyoid
Sternohyoid
Omohyoid
Thyrohyoid
Mylohyoid
Digastric - hooks under tendon to hyoid

Question 26

What muscles are innervated by Ventral rami from C1-C3 via ansa cervicalis

Answer 26

Sternohyoid
Omohyoid
Sternothyroid