Cx plexus

Question 1

How many nerves are in the cervical plexus?

Answer 1

8

Question 2

Where do the cervical plexus nerves originate?

Answer 2

Anterior rami C1-5

Question 3

What are the nerves of the cervical plexus?

Answer 3

Geniohyoid
Ansa cervicalis
Spinal accessory
Lesser occipital
Greater auricular
Transverse cervical
Supraclavicular
Phrenic

Question 4

Which nerves of the plexus are sensory, which are motor, and which are both?

Answer 4

There are 3 motor nerves - the nerve to geniohyoid, the ansa cervicalis, and the spinal accessory.

There is 1 mixed nerve - the phrenic.

There are 4 sensory nerves - the lesser occipital, greater auricular, transverse cervical, and supraclavicular.

Question 5

Describe the nerves of the plexus including the spinal nerves they arise from, and their functions

Answer 5

Nerve to geniohyoid - motor nerve to suprahyoids. C1

Ansa cervicalis - motor nerve to infrahyoids. c1-3

Spinal accessory - motor nerve to SCM & traps. C1-5

Lesser occipital - skin of posterior & superior scalp. C2

Greater auricular - skin of external ear and parotid gland. C2-3

Transverse cervical - skin to anterior neck. C2-3

Supraclavicular - skin to upper thoracic. C3-5

Phrenic. sensory of the pleura, motor of the diaphragm. C3-5