APE 3: Nerves

Question 1

Name the 5 major peripheral nerves of the brachial plexus

Answer 1

The musculocutaneous nerve
The radial nerve
The axillary nerve
The median nerve
The ulnar nerve

Question 2

Which 5 spinal nerve roots supply the brachial plexus?

Answer 2

C5 C6 C7 C8 T1

Question 3

Which spinal nerve roots supply the musculocutaneous nerve?

Answer 3

C5, C6, C7

Question 4

Which spinal nerve roots supply the radial nerve?

Answer 4

C5 C6 C7 C8 T1

Question 5

Which spinal nerve roots supply the axillary nerve?

Answer 5

C5 C6

Question 6

Which spinal nerve roots supply the median nerve?

Answer 6

C5 C6 C7 C8 T1

Question 7

Which spinal nerve roots supply the ulnar nerve?

Answer 7

C8 T1

Question 8

What does the brachial plexus consist of?

Answer 8

Roots (5)
Trunks (3)
Divisions (6)
Cords (3)
Branches (5)

Question 9

Which 8 spinal nerve roots supply the lumbosacral plexus?

Answer 9

L1 L2 L3 L4 L5 S1 S2 S3

Question 10

Which spinal nerve roots supply the lumbar plexus?

Answer 10

L1 L2 L3 L4

Question 11

Which spinal nerve roots supply the sacral plexus?

Answer 11

S1 S2 S3 and the lumbosacral trunk is supplied by L4/5

Question 12

What is the largest nerve in the body?

Answer 12

The sciatic nerve

Question 13

What 2 nerves does the sciatic nerve bifurcate into?

Answer 13

The tibial nerve and the common fibular nerve

Question 14

What is the motor target of the tibial nerve?

Answer 14

The muscles of the posterior thigh (hamstring), and the triceps surae (the soleus and the gastrocnemius)

Question 15

What muscles does the femoral nerve supply?

Answer 15

The quadriceps

Question 16

What’s the name of the tendon struck for the knee jerk reflex?

Answer 16

The patellar tendon

Question 17

What does the obturator nerve supply?

Answer 17

The medial compartment of the thigh (adductor)

Question 18

Describe the origin of the spinal roots

Answer 18

Each spinal nerve is attached to the cord by 2 roots. The anterior root contains motor fibres leaving the spinal cord, while the posterior root contains sensory fibres entering the spinal cord. The dorsal root has a discrete swelling called the dorsal root ganglion, while the ventral root does not. The dorsal root ganglion contains cell bodies of primary sensory neurones.