Muscles Of The Anterior Neck (Nerves And Actions)

Question 1

Sternocleidomastoid

Answer 1

N: Accessory n and ventral rami C2 - C3

A: Flexion, ipsilateral flexion,
and rotation to the opposite
side of CS. Extends head, and elevates the sternum and clavicle during forced inspiration

Question 2

Mylohyoid

Answer 2

N: Trigeminal n

A: Elevates hyoid bone and floor of mouth (swallowing) and depresses mandible

Question 3

Digastric

Answer 3

N: Anterior belly - Trigeminal n
Posterior belly - Facial n

A: Elevates hyoid bone and
depresses mandible

Question 4

Geniohyoid

Answer 4

N: First cervical n - C1

A: Elevates hyoid bone and depresses mandible

Question 5

Stylohyoid

Answer 5

N: Fascial n

A: Elevates and retracts the hyoid bone

Question 6

Thyrohyoid

Answer 6

N: First cervical n - C1

A: Elevates thyroid cartilage (larynx) and depresses hyoid bone

Question 7

Anterior Scalene

Answer 7

N: Ventral rami of C4 - C6

A: Elevates 1st rib during forced
inspiration, lateral flexion,
flexion and rotation to the
opposite side of the CS

Question 8

Sternohyoid

Answer 8

N: Branches of ansa cervicalis C1-C3

A: Depresses hyoid bone

Question 9

Omohyoid

Answer 9

N: Branches of ansa cervicalis C1-C3

A: Depresses hyoid bone

Question 10

Sternothyroid

Answer 10

N: Branches of ansa cervicalis C1-C3

A: Depresses thyroid cartilage (larynx)

Question 10

Middle Scalene

Answer 10

N: Ventral rami of C3 - C8

A: Elevates 1st rib during forced
inspiration, lateral flexion,
flexion and rotation to the
opposite side of the CS

Question 11

Posterior Scalene

Answer 11

N: Ventral rami of C6 - C8

A: Elevates 2nd rib during forced
inspiration, lateral flexion,
flexion and rotation to the
opposite side of the CS

Question 12

Longus Capitis

Answer 12

N: Ventral rami of C1-C4

A: Flexion and lateral flexion
of the head and CS

Question 13

Longus Colli

Answer 13

N: Ventral rami C2 - C8

A: Flexion and lateral flexion of the CS