Cervical Plexus: Motor

Question 1

Other than the sensory nerves, what muscles does the Cevcial Plexus give motor supply to?

Answer 1

Infrahyoid (strap) muscles

Question 2

What are the infrahyoid muscles responsible for?

Answer 2

speech, swallowing, movement of the mandible

Question 3

the structure that gives rise to the motor fibers that supply the infrahyoid muscles.

Answer 3

Ansa Cervicalis

Question 4

The nerve levels that form the superior root of the ansa cervicalis.

Answer 4

C1 (sometimes C1 and C2). This portion also descends from the hypoglossal nerve.

Question 5

The nerve levels that form the inferior root of the ansa cervicalis.

Answer 5

C2 and C3.

Question 6

When the to roots fo the ansa cervicalis unit, they supply what?

Answer 6

Three of the four infrahyoid muslces:

1) sternohyoid
2) sternothyroid
3) omohyoid

Question 7

The nerve that supplies the thyrohyoid muscle

Answer 7

Exclusively from C1 fibers through the hypoglossal nerve

Question 8

The mixed nerve that is considered to be part of the cervical plexus.

Answer 8

Phrenic Nerve

Question 9

Teh origins of the Phrenic nerve

Answer 9

C3, C4, C5

Question 10

Teh nerve supply of the phrenic nerve

Answer 10

Motor: Diaphragm
Sensory: Some membranes of the thorax and abdomen

Question 11

the muscle that runs with the the phrenic nerve as it runs vertically down said muscle and into the thorax

Answer 11

The Anterior Scalene Muscle