Cervical Plexus

Question 1

C1 directly innervates which muscles?

Answer 1

Geniohyoid

Thyrohyoid

Question 2

Ansa cervicalis

Answer 2

Originates from C1-C3
Inntervates sternothyroid, sternohyoid, and omohyoid (separate branches for interfior and superior belly)
On surface of carotid sheath, superior to internal jugular vein

Question 3

What are the sensory branches of the cervical plexus (from superior to inferior)?

Answer 3

Lesser occipital
Great auricular
Transverse cervical
Supraclavicular nerves

Question 4

Lesser occipital nerves

Answer 4

Sensory nerves from C2-C3
Branch into: auricular, mastoid, occipital terminal branches - innervates skin of these areas
Runs posterior to SCM and heads towards mastoid process

Question 5

Great auricular nerves

Answer 5

Sensory nerves from C2-C3
Branch into: mastoid, auricular, facial terminal branches - innervates skin of these areas
Travels across SCM towards parotid gland

Question 6

Transverse cervical nerves

Answer 6

Sensory nerves from C2-C3
Branches into: superior and inferior terminal branches
Travels across SCM
Innervates skin of anterior neck

Question 7

Supraclavicular nerves

Answer 7

Sensory nerves from C3-C4
Branches into: medial, intermediate, and lateral terminal branches
Travels posterior to SCM and inferiorly over clavicle
Innervates skin of upper chest and shoulder

Question 8

Where do the sensory branches of the cervical plexus branch from?

Answer 8

Erb’s point - midpoint posterior to SCM

Question 9

Which muscles do the motor branches of the cervical plexus innervate?

Answer 9

Geniohyoid
Thyrohyoid
Omohyoid (superior and inferior belly)
Sternothyroid
Sternohyoid