Question 1

Which of the following best describes the functional organization of the peripheral nervous system (PNS)?

Accepted Answer

The PNS is divided into sensory (afferent) and motor (efferent) divisions, each with somatic and visceral components.

Question 2

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

Accepted Answer

Lumbar plexus

Question 3

Which cranial nerve is unique in that it extends beyond the head and neck into the abdomen?

Accepted Answer

Vagus nerve (X)

Question 4

Which type of sensory receptor is responsible for detecting muscle stretch and is embedded within the perimysium between muscle fascicles?

Accepted Answer

Muscle spindle

Question 5

A viral infection that reactivates in adulthood, causing a painful rash along a dermatome, is most likely:

Accepted Answer

Shingles (herpes zoster)

Question 6

Which of the following best describes the role of the dorsal root of a spinal nerve?

Accepted Answer

It contains sensory fibers whose cell bodies are located in the dorsal root ganglion.

Question 7

Which nerve is the most important branch of the cervical plexus and innervates the diaphragm?

Accepted Answer

Phrenic nerve

Question 8

A patient with diabetes develops burning pain and loss of sensation in the feet. This is most likely due to:

Accepted Answer

Peripheral neuropathy

Question 9

Which of the following is TRUE regarding the brachial plexus?

Accepted Answer

It is formed by the ventral rami of C5–T1 and gives rise to nerves that innervate the upper limb.

Question 10

Which of the following proprioceptors is located near the muscle-tendon junction and monitors tension within tendons?

Accepted Answer

Golgi tendon organ

Question 11

A person experiences nausea and hunger due to stimulation of which sensory division?

Accepted Answer

General visceral sensory

Question 12

Which of the following best describes the function of rami communicantes?

Accepted Answer

They connect the ventral ramus to the sympathetic chain ganglia.

Question 13

Which cranial nerve is primarily responsible for hearing and equilibrium?

Accepted Answer

Vestibulocochlear nerve (VIII)

Question 14

Which of the following is a correct sequence for the organization of the brachial plexus from medial to lateral?

Accepted Answer

Ventral rami → Trunks → Divisions → Cords

Question 15

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

Accepted Answer

Axillary nerve

Question 16

Which of the following best describes the difference between free nerve endings and encapsulated nerve endings?

Accepted Answer

Free nerve endings monitor general sensory information, while encapsulated endings detect pressure, pain, and stretch.

Question 17

Which nerve innervates the adductor muscles of the thigh?

Accepted Answer

Obturator nerve

Question 18

A patient presents with foot drop and loss of dorsiflexion. Which nerve is most likely affected?

Accepted Answer

Common fibular (peroneal) nerve

Question 19

Which of the following is a symptom of peripheral neuropathy involving motor nerves?

Accepted Answer

Muscle weakness and paralysis

Question 20

Which of the following equations best represents the relationship between the number of spinal nerves and their regional distribution?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Peripheral Nervous System: Structure, Function, and Clinical Relevance

Study Guide - Practice Questions