Q: Which equation correctly represents the conduction velocity ($$v) of a $$nerve fiber as a function of its diameter ($$d) $$and myelination status ($$m$$), where $$m = 1$$ for myelinated and $$m = 0$$ for unmyelinated fibers?

$$v = k \times d$$^{0.5}$$ \times (1 + m)$$

Question 1

Which of the following structures is NOT part of the peripheral nervous system (PNS)?

Accepted Answer

Brain

Question 2

Sensory receptors can be classified by location. Which type of receptor is most likely to detect changes in blood pressure within arteries?

Accepted Answer

Interoceptor

Question 3

Which connective tissue layer directly surrounds individual nerve fibers (axons) in a peripheral nerve?

Accepted Answer

Endoneurium

Question 4

A patient presents with loss of sensation in the lateral forearm. Which nerve is most likely affected?

Accepted Answer

Musculocutaneous nerve

Question 5

Which of the following best describes the order of sensory processing from stimulus to perception?

Accepted Answer

Receptor level → Circuit level → Perceptual level

Question 6

Referred pain occurs when pain from an internal organ is perceived as originating from a superficial region. Which of the following is the best explanation for this phenomenon?

Accepted Answer

Visceral and somatic sensory fibers converge on the same spinal neurons

Question 7

Which equation correctly represents the conduction velocity ($$v) of a $$nerve fiber as a function of its diameter ($$d) $$and myelination status ($$m$$), where $$m = 1$$ for myelinated and $$m = 0$$ for unmyelinated fibers?

Accepted Answer

$$v = k 	imes d$$^{0.5}$$ 	imes (1 + m)$$

Question 8

A patient cannot extend their wrist and has loss of sensation over the posterior arm and forearm. Which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 9

Which spinal nerve plexus is responsible for innervating the diaphragm, and which nerve is the primary motor supply?

Accepted Answer

Cervical plexus; phrenic nerve

Question 10

Which of the following nerves innervates the anterior thigh muscles and is part of the lumbar plexus?

Accepted Answer

Femoral nerve

Question 11

A patient presents with foot drop and inability to dorsiflex the foot. Which nerve is most likely injured?

Accepted Answer

Common fibular (peroneal) nerve

Question 12

Which of the following reflexes is tested by tapping the patellar tendon, and what is the expected response?

Accepted Answer

Knee jerk reflex; extension of the leg

Question 13

Which nerve is responsible for innervating the skin of the lateral hand and the thenar muscles?

Accepted Answer

Median nerve

Question 14

Which of the following best describes the difference between encapsulated and non-encapsulated sensory receptors?

Accepted Answer

Encapsulated receptors have a connective tissue capsule and are specialized for detecting specific stimuli

Question 15

Which nerve innervates the flexor muscles of the forearm and some muscles of the hand, and is commonly compressed in carpal tunnel syndrome?

Accepted Answer

Median nerve

Question 16

If a patient has difficulty abducting their arm at the shoulder, which nerve is most likely affected?

Accepted Answer

Axillary nerve

Question 17

Which equation best represents the relationship between stimulus intensity ($$I) $$and the frequency of action potentials ($$f) $$generated by a sensory neuron?

Accepted Answer

$$f = k 	imes I$$

Question 18

Which nerve is responsible for innervating the adductor muscles of the thigh?

Accepted Answer

Obturator nerve

Question 19

Which of the following is TRUE regarding the plantar reflex?

Accepted Answer

A normal response in adults is plantar flexion of the toes

Question 20

Which nerve is most likely to be injured if a patient cannot flex their wrist and has numbness in the medial hand?

Accepted Answer

Ulnar nerve

Peripheral Nervous System and Reflexes: Study Guide Notes

Study Guide - Practice Questions

Study Guide - Flashcards