Question 1

Which of the following best describes the function of proprioceptors?

Accepted Answer

They respond to the degree of stretch of organs they occupy, providing information about body position and movement.

Question 2

A patient presents with loss of sensation in the anterior two-thirds of the tongue and inability to produce tears. Which cranial nerve is most likely affected?

Accepted Answer

Cranial Nerve VII (Facial)

Question 3

Which of the following is TRUE regarding the regeneration of nerve fibers in the peripheral nervous system (PNS)?

Accepted Answer

If the soma remains intact, Schwann cells and macrophages coordinate to allow axonal regeneration.

Question 4

Which of the following best explains why referred pain occurs, such as left arm pain during a heart attack?

Accepted Answer

Visceral and somatic pain fibers travel along the same nerves, causing the brain to misinterpret the origin of the pain.

Question 5

Which connective tissue layer directly surrounds individual axons within a peripheral nerve?

Accepted Answer

Endoneurium

Question 6

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

Accepted Answer

Cranial Nerve VI (Abducens)

Question 7

Which of the following is a function of the Golgi tendon organ in the tendon reflex?

Accepted Answer

It inhibits the contracting muscle and activates the antagonist muscle to prevent damage from excessive tension.

Question 8

Which of the following cranial nerves carries parasympathetic fibers to the heart, lungs, and visceral organs?

Accepted Answer

Cranial Nerve X (Vagus)

Question 9

Which of the following best describes the difference between sensation and perception?

Accepted Answer

Sensation is the awareness of changes in the environment, while perception is the conscious interpretation of those stimuli.

Question 10

Which of the following is NOT a component of a reflex arc?

Accepted Answer

Thalamus

Question 11

A patient has lost the ability to taste on the posterior one-third of the tongue and has impaired swallowing. Which cranial nerve is most likely affected?

Accepted Answer

Cranial Nerve IX (Glossopharyngeal)

Question 12

Which of the following best describes the role of alpha ($$ \alpha ) $$and gamma ($$ \gamma ) $$efferent fibers in muscle spindle function?

Accepted Answer

Alpha fibers innervate extrafusal fibers; gamma fibers innervate intrafusal fibers, maintaining spindle sensitivity during contraction.

Question 13

Which of the following is TRUE regarding dermatomes?

Accepted Answer

A dermatome is the area of skin innervated by the cutaneous branches of a single spinal nerve, and most dermatomes overlap.

Question 14

Which of the following best describes the function of the plantar reflex in a clinical setting?

Accepted Answer

It tests the integrity of the spinal cord from L4 to S2 by observing the downward flexion of the toes.

Question 15

Which of the following is a learned (acquired) reflex?

Accepted Answer

Driving skills

Question 16

Which of the following best describes the role of Schwann cells in nerve regeneration in the PNS?

Accepted Answer

They form a regeneration tube and secrete growth factors to guide axonal regrowth.

Question 17

Which of the following cranial nerves is responsible for innervating the trapezius and sternocleidomastoid muscles?

Accepted Answer

Cranial Nerve XI (Accessory)

Question 18

Which of the following is the correct order of the five components of a reflex arc?

Accepted Answer

Receptor, sensory neuron, integration center, motor neuron, effector

Question 19

Which of the following best describes the function of the muscle spindle during a stretch reflex?

Accepted Answer

It detects muscle stretch and initiates contraction of the stretched muscle.

Question 20

Which of the following is TRUE regarding mixed nerves?

Accepted Answer

They contain both sensory and motor fibers, carrying impulses to and from the CNS.

Peripheral Nervous System & Reflex Activity: Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards