Innervations of Neck Muscles

Question 1

Trapezius m.

Answer 1

CN XI

Question 2

SCM m.

Answer 2

CN XI

Question 3

Anterior scalene m.

Answer 3

C4-6

Question 4

Middle scalene m.

Answer 4

C3-8

Question 5

Posterior scalene m.

Answer 5

C6-8

Question 6

Mylohyoid m.

Answer 6

Mylohyoid n. (from mandibular n.)

Question 7

Geniohyoid m.

Answer 7

C1 via CN XII

Question 8

Anterior belly of digastric m.

Answer 8

Mylohyoid n. (from mandibular n.)

Question 9

Posterior belly of digastric m.

Answer 9

CN VII

Question 10

Stylohyoid m.

Answer 10

CN VII

Question 11

Sternohyoid m.

Answer 11

Ansa cervicalis

Question 12

Sternothyroid m.

Answer 12

Ansa cervicalis

Question 13

Thyrohyoid m.

Answer 13

C1 via CN XII

Question 14

Omohyoid m.

Answer 14

Ansa cervicalis

Question 15

Platysma m.

Answer 15

CN VII

Question 16

All pharyngeal ms.

What is the exception?

Answer 16

Pharyngeal branches from CN X

Stylopharyngeus m. - CN IX

Question 17

All laryngeal ms.

What is the exception?

Answer 17

Recurrent laryngeal n.

Cricothyroid m.

Question 18

Stylopharyngeus m.

Answer 18

CN IX

Question 19

Cricothyroid m.

Answer 19

External laryngeal n.

Question 20

All anterior vertebral column ms.

Answer 20

Anterior rami of cervical spinal nerves.

Question 21

Suprahyoid ms. (4)

Answer 21

Mylohyoid m.
Geniohyoid m.
A/P bellies of digastric m.
Stylohyoid m.

Question 22

Infrahyoid ms. (4)

Answer 22

Sternohyoid m.
Sternothyroid m.
Thyrohyoid m.
Omohyoid m.

Question 23

All of the infrahyoid ms. are innervated by ansa cervicalis, except:

Answer 23

Thyrohyoid m. (C1 via CN XII)

Question 24

Which muscles are innervated by CN VII? (3)

Answer 24

Posterior belly of digastric m.
Stylohyoid m.
Platysma m.

Question 25

Muscles innervated by C1 via CN XII (2)

Answer 25

Geniohyoid m.

Thyrohyoid m.

Question 26

Which muscles are innervated by Ansa cervicalis? (3)

Answer 26

Sternohyoid m.
Sternothyroid m.
Omohyoid m.

Question 27

Which muscles are innervated by mylohyoid n.? (2)

Answer 27

Mylohyoid m.

Anterior belly of digastric m.