Question 1

Which division of the peripheral nervous system is responsible for the 'fight-or-flight' response, and what neurotransmitter is primarily involved in this process?

Accepted Answer

The autonomic division; norepinephrine

Question 2

A patient presents with loss of sensation in a specific region of skin on their arm. Which anatomical concept explains the mapping of this sensory loss, and why is it clinically significant?

Accepted Answer

Dermatome; it helps localize spinal nerve or root injuries

Question 3

Which cranial nerve is responsible for facial expressions, and is it classified as sensory, motor, or mixed?

Accepted Answer

Facial nerve (VII); mixed

Question 4

If a spinal nerve is damaged at the dorsal root, which function is most likely to be impaired?

Accepted Answer

Sensory function

Question 5

Which of the following best describes a mixed nerve?

Accepted Answer

A nerve containing both sensory and motor fibers

Question 6

The phrenic nerve is crucial for breathing. From which plexus does it arise?

Accepted Answer

Cervical plexus

Question 7

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

Accepted Answer

Endoneurium

Question 8

A patient is unable to flex their hip and extend their knee. Which nerve and plexus are most likely affected?

Accepted Answer

Femoral nerve; lumbar plexus

Question 9

Which type of sensory receptor detects changes in blood pH and is located within the body?

Accepted Answer

Interoreceptor

Question 10

During a routine neurological exam, a physician taps the patellar tendon and observes a knee-jerk response. Which pathway is being tested?

Accepted Answer

Reflex arc

Question 11

Which equation best represents the conduction velocity ($$v) of a $$nerve impulse, given the axon diameter ($$d) $$and myelination factor ($$m$$)?

Accepted Answer

$$v = d 	imes m$$

Question 12

Which cranial nerve innervates the heart, lungs, and digestive tract, and what is its primary function?

Accepted Answer

Vagus nerve (X); parasympathetic regulation

Question 13

A patient has difficulty moving their lower leg and foot. Which nerve and plexus are most likely involved?

Accepted Answer

Sciatic nerve; sacral plexus

Question 14

Which of the following best describes the function of proprioceptors?

Accepted Answer

Monitor the position and movement of body parts

Question 15

Which of the following is the correct sequence for the components of a reflex arc?

Accepted Answer

Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 16

Which equation would you use to estimate the number of spinal nerves ($$N) $$given the number of vertebrae ($$V) $$and the number of nerve roots per vertebra ($$R$$)?

Accepted Answer

$$N = V 	imes R$$

Question 17

Which type of nerve fiber would be most affected in a patient with multiple sclerosis, and what would be the expected clinical outcome?

Accepted Answer

Myelinated motor fibers; slowed or blocked muscle movement

Question 18

Which of the following best describes the difference between the somatic and autonomic divisions of the motor (efferent) system?

Accepted Answer

Somatic controls voluntary muscles; autonomic controls involuntary organs

Question 19

Which sensory receptor would be activated when you touch a hot surface, and what type of stimulus does it detect?

Accepted Answer

Thermoreceptor; temperature

Question 20

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

Accepted Answer

Accessory nerve (XI)

Peripheral Nervous System: Structure, Function, and Clinical Relevance

Guida di studio - Domande di pratica

Study guide - Flashcard