Question 1

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

Accepted Answer

It contains sensory fibers that transmit impulses to the CNS.

Question 2

A patient loses the ability to feel temperature changes in their skin. Which type of sensory receptor is most likely damaged?

Accepted Answer

Thermoreceptors

Question 3

Which cranial nerve is responsible for transmitting sensory information related to hearing and equilibrium?

Accepted Answer

VIII Vestibulocochlear

Question 4

A person is unable to move their lateral rectus muscle of the eye. Which cranial nerve is most likely affected?

Accepted Answer

VI Abducens

Question 5

Which of the following is TRUE regarding the organization of the somatosensory system?

Accepted Answer

Pattern recognition involves connecting pieces to recognize complex stimuli.

Question 6

Which nerve from the brachial plexus innervates the major and minor muscles that move the scapula?

Accepted Answer

Dorsal scapular nerve

Question 7

A patient presents with loss of sensation in the anterior thigh and difficulty extending the knee. Which nerve is most likely affected?

Accepted Answer

Femoral nerve

Question 8

Which of the following best describes a reflex arc?

Accepted Answer

It is a pathway involving receptor, sensory neuron, integration center, motor neuron, and effector.

Question 9

Which of the following equations correctly represents the relationship between stimulus intensity and receptor potential amplitude?

Accepted Answer

$V_{RP} = k 	imes I_{stim}$

Question 10

Which type of sensory receptor is most likely to be found in the skin and respond to light touch?

Accepted Answer

Meissner's corpuscle

Question 11

A patient has difficulty swallowing and loss of taste sensation from the posterior third of the tongue. Which cranial nerve is most likely affected?

Accepted Answer

IX Glossopharyngeal

Question 12

Which of the following statements about dermatomes is correct?

Accepted Answer

Dermatomes are regions of skin supplied by cutaneous branches of a single spinal nerve.

Question 13

Which of the following cranial nerves is responsible for motor innervation to the muscles of mastication?

Accepted Answer

V Trigeminal

Question 14

Which of the following best describes the role of proprioceptors?

Accepted Answer

They detect changes in movement, equilibrium, and body position.

Question 15

A patient is unable to shrug their shoulders or turn their head against resistance. Which cranial nerve is most likely damaged?

Accepted Answer

XI Accessory

Question 16

Which of the following is a correct statement about the classification of sensory receptors by complexity?

Accepted Answer

Encapsulated dendritic endings are found primarily in connective tissue and respond mainly to pressure and touch.

Question 17

Which equation best represents the two-point discrimination threshold ($D_{2pt}$) in terms of receptive field size ($R_{field}$)?

Accepted Answer

$D_{2pt} \propto R_{field}$

Question 18

Which of the following nerves is part of the lumbar plexus and is responsible for innervating the anterior thigh muscles?

Accepted Answer

Femoral nerve

Question 19

Which of the following is a function of the autonomic (visceral) reflexes?

Accepted Answer

Regulation of heart rate, breathing rate, and digestive activities

Question 20

A patient has lost the ability to flex their forearm and has numbness in the lateral forearm. Which nerve from the brachial plexus is most likely affected?

Accepted Answer

Musculocutaneous nerve

Peripheral Nervous System: Sensory Receptors, Nerves, and Reflexes

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