Question 1

Which nerve is derived from the posterior cord of the brachial plexus?

Accepted Answer

Radial nerve

Question 2

A patient presents with loss of sensation over the lateral forearm and weakness in elbow flexion. Which nerve is most likely affected?

Accepted Answer

Musculocutaneous nerve

Question 3

Which nerve roots contribute to the formation of the sciatic nerve?

Accepted Answer

$$L4-S3$$

Question 4

The phrenic nerve, which innervates the diaphragm, arises from which plexus?

Accepted Answer

Cervical plexus

Question 5

Which of the following muscles is innervated by the cervical plexus?

Accepted Answer

Diaphragm

Question 6

A lesion to the medial cord of the brachial plexus would most likely affect which nerve?

Accepted Answer

Ulnar nerve

Question 7

Which nerve roots give rise to the femoral nerve?

Accepted Answer

$$L2-L4$$

Question 8

The lateral cord of the brachial plexus is formed from which nerve roots?

Accepted Answer

$$C5, C6, C7$$

Question 9

Which two cords of the brachial plexus are part of the anterior division?

Accepted Answer

Medial and lateral cords

Question 10

A patient has difficulty abducting the arm and numbness over the deltoid region. Which nerve is most likely damaged?

Accepted Answer

Axillary nerve

Question 11

Which nerve is responsible for the majority of hand flexion and is derived from both the medial and lateral cords?

Accepted Answer

Median nerve

Question 12

The common fibular nerve is a branch of which plexus?

Accepted Answer

Sacral plexus

Question 13

Which nerve roots give rise to the tibial nerve?

Accepted Answer

$$L4-S3$$

Question 14

Which nerve is most likely to be injured in a fracture of the medial epicondyle of the humerus?

Accepted Answer

Ulnar nerve

Question 15

Which of the following is NOT a branch of the brachial plexus?

Accepted Answer

Obturator nerve

Question 16

Which nerve supplies the skin over the anterior thigh?

Accepted Answer

Femoral nerve

Question 17

A patient presents with foot drop after a fibular neck fracture. Which nerve is most likely injured?

Accepted Answer

Common fibular nerve

Question 18

Which nerve roots give rise to the lateral femoral cutaneous nerve?

Accepted Answer

$$L2-L3$$

Question 19

Which nerve is responsible for the sensory innervation of the lateral aspect of the forearm?

Accepted Answer

Musculocutaneous nerve

Question 20

Which of the following best describes the organization of the brachial plexus from proximal to distal?

Accepted Answer

Roots, trunks, divisions, cords, branches

Spinal Nerves and Plexuses Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions