Question 1

Which of the following best describes the relationship between a spinal nerve root and a spinal nerve?

Accepted Answer

A spinal nerve is formed by the union of a dorsal and ventral root.

Question 2

Which of the following is NOT one of the four major spinal nerve plexuses?

Accepted Answer

Thoracic plexus

Question 3

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

Accepted Answer

Cervical plexus

Question 4

Which of the following best describes a ganglion in the context of the spinal nerves?

Accepted Answer

A cluster of neuron cell bodies located outside the central nervous system

Question 5

A patient presents with loss of sensation and motor function in the anterior thigh. Which plexus is most likely affected?

Accepted Answer

Lumbar plexus

Question 6

Which nerve emerges from the brachial plexus and is responsible for innervating the muscles of the forearm and hand?

Accepted Answer

Median nerve

Question 7

The sciatic nerve, the largest nerve in the body, arises from which plexus?

Accepted Answer

Sacral plexus

Question 8

Which of the following best describes the function of the dorsal ramus of a spinal nerve?

Accepted Answer

It innervates the muscles and skin of the back.

Question 9

A patient suffers a penetrating injury to the ventral root of a spinal nerve. Which function is most likely lost?

Accepted Answer

Motor control of skeletal muscles

Question 10

Which of the following is a correct sequence for the organization of a spinal nerve from medial to lateral?

Accepted Answer

Root → Nerve → Ramus

Question 11

Which of the following nerves is NOT correctly matched with its plexus?

Accepted Answer

Radial nerve – Sacral plexus

Question 12

Which of the following best explains why spinal nerve plexuses are clinically significant?

Accepted Answer

They allow for redundancy in nerve supply to limbs, reducing the impact of nerve injury.

Question 13

A patient cannot flex their wrist and has numbness in the lateral palm. Which nerve and plexus are most likely involved?

Accepted Answer

Median nerve, Brachial plexus

Question 14

Which of the following is a function of the major spinal nerves?

Accepted Answer

Transmitting both sensory and motor information between the body and the spinal cord.

Question 15

If the lumbar plexus is damaged, which of the following functions is most likely to be impaired?

Accepted Answer

Extension of the knee

The Spinal Nerves: Structure, Plexuses, and Functions

Study Guide - Practice Questions