Question 1

Which of the following best describes the main function of the peripheral nervous system (PNS)?

Accepted Answer

To link the central nervous system (CNS) to the body and external environment by detecting sensory stimuli and delivering information to the CNS.

Question 2

A patient presents with loss of sensation in the skin and inability to move muscles below the neck. Which type of nerve is most likely damaged?

Accepted Answer

Spinal nerve

Question 3

Which cranial nerve is responsible for transmitting visual information from the retina to the brain?

Accepted Answer

Optic (II)

Question 4

Which of the following is TRUE regarding the organization of the brachial plexus?

Accepted Answer

The medial cord is formed by the anterior division of the inferior trunk.

Question 5

Which type of sensory receptor is primarily responsible for detecting changes in muscle length and position?

Accepted Answer

Proprioceptor

Question 6

A person accidentally touches a hot stove and immediately withdraws their hand. Which reflex is primarily responsible for this action?

Accepted Answer

Flexion (withdrawal) reflex

Question 7

Which of the following best describes the function of the Golgi tendon organ?

Accepted Answer

Monitors tension generated by muscle contraction and triggers muscle relaxation to prevent damage.

Question 8

Which of the following cranial nerves is classified as a mixed nerve and is involved in both sensory and motor functions of the face?

Accepted Answer

Facial (VII)

Question 9

Which of the following statements about spinal nerves is CORRECT?

Accepted Answer

All spinal nerves are mixed nerves containing both sensory and motor fibers.

Question 10

Which equation best represents the relationship between conduction velocity ($$v$$), axon diameter ($$d$$), and myelination in peripheral nerves?

Accepted Answer

$$v \propto d ($$velocity is proportional to diameter)

Question 11

A patient has difficulty swallowing and a diminished gag reflex. Which cranial nerve is most likely affected?

Accepted Answer

Glossopharyngeal (IX)

Question 12

Which of the following best describes the difference between the somatic and autonomic motor divisions of the PNS?

Accepted Answer

Somatic motor division controls voluntary skeletal muscles, while autonomic controls involuntary muscles and glands.

Question 13

Which of the following is a function of the parasympathetic nervous system?

Accepted Answer

Promoting digestion and maintaining homeostasis at rest

Question 14

Which of the following mechanoreceptors is responsible for detecting high-frequency vibration and deep pressure?

Accepted Answer

Lamellated (Pacinian) corpuscle

Question 15

A patient is unable to abduct their eye laterally. Which cranial nerve is most likely damaged?

Accepted Answer

Abducens (VI)

Question 16

Which of the following best describes the sequence of events in a simple stretch reflex?

Accepted Answer

External force stretches muscle, muscle spindle detects stretch, sensory neuron sends signal to CNS, motor neuron triggers contraction.

Question 17

Which of the following is TRUE regarding the structure of a peripheral nerve?

Accepted Answer

Peripheral nerves are composed of bundles of axons (fascicles) surrounded by perineurium, with the entire nerve encased in epineurium.

Question 18

Which of the following best explains why the sciatic nerve is clinically significant?

Accepted Answer

It is the longest and largest nerve in the body, and injury can cause widespread lower limb dysfunction.

Question 19

Which of the following best describes the role of lower motor neurons in movement?

Accepted Answer

They receive commands from upper motor neurons and directly stimulate skeletal muscle fibers to contract.

Question 20

Which of the following is a correct pairing of a cranial nerve and its primary function?

Accepted Answer

Vestibulocochlear (VIII) – transmits auditory and equilibrium information

The Peripheral Nervous System: Structure, Function, and Integration

Study Guide - Practice Questions