Cervical Plexus

Question 1

What are the major branches of the cervical plexus

Answer 1

• Lesser occipitaln
• Great auricular n
• Tranverse cervical n
• Supraclavicular n
• Phrenic n
• Ansa Cervicalils
• Associated with cranial nerve 7

Question 2

Which nerves are sensory in the Cervicalplexus

Answer 2

Lesser Occipital

Great Auricular

Tranverse Cervical

Supraclavicular

Question 3

Lesser Occipital

Answer 3

C2

Skin of neck and scalp posterior to ear

Question 4

Great auricular

Answer 4

C2-3

Skin of inferior parotid region, ear, mastoid area

Question 5

Tranverse Cervical n

Answer 5

C2 and C3

Lateral and anterior of neck

Question 6

Supraclavicular n

Answer 6

C3 and C4

Skin over clavicle and shoulder

Question 7

Erbs point

Answer 7

Point where 4 branches of cervical plexus emerge

Lesser occipital

Great auricular

Tranverse cervical

Supraclavicular

Question 8

Phrenic n

Answer 8

Mixed

C3, C4, C5

Runs along anterior scalene, deep to carotid sheath

Sensory and motor to diaphragm

Question 9

Ansa Cervicalis

Answer 9

• Loop of nerve fibers
  
  • Superior and inferior
  • C2 C3 and C4
• Travels with CN 12

Question 10

Carotid Sheath

Answer 10

Inside: Carotid artery, jugular vein, CN X 10

Ansa cervicalis is embeded in the wall of the sheath

CN XII 12 is associated with it

Question 11

What does the Ansa Cervicalis innervate?

Answer 11

Innervates 3 of the 4 infrahyoid muscles

• Omohyoid
• Sternohyoid
• Sternothyroid