Question 1

Which of the following best describes the primary function of the Peripheral Nervous System (PNS)?

Accepted Answer

Communication between the Central Nervous System and the rest of the body

Question 2

A patient presents with loss of sensation in the skin of the lateral forearm and weakness in elbow flexion. Which nerve plexus and major nerve are most likely affected?

Accepted Answer

Brachial plexus; musculocutaneous nerve

Question 3

Which receptor type is responsible for detecting deep pressure and high-frequency vibration, and where is it primarily located?

Accepted Answer

Pacinian corpuscle; deep dermis and joint capsules

Question 4

During a routine neurological exam, a patient is asked to stick out their tongue. The tongue deviates to the right. Which cranial nerve is most likely damaged, and on which side?

Accepted Answer

Hypoglossal nerve (CN XII); right side

Question 5

Which of the following best explains why referred pain occurs?

Accepted Answer

Visceral and somatic sensory fibers converge onto the same spinal pathways

Question 6

A patient with carpal tunnel syndrome is most likely experiencing compression of which nerve, and what are typical symptoms?

Accepted Answer

Median nerve; tingling, numbness, and weak grip in the thumb, index, and middle fingers

Question 7

Which equation correctly represents the relationship between stimulus intensity and action potential frequency in sensory neurons?

Accepted Answer

$$f_{AP} \propto I_{stimulus}$$

Question 8

Which of the following is TRUE regarding the regeneration of peripheral nerves compared to central nervous system neurons?

Accepted Answer

Peripheral nerves regenerate well because Schwann cells form regeneration tubes and release growth factors

Question 9

Which cranial nerve is responsible for both taste sensation from the anterior two-thirds of the tongue and motor control of facial expression?

Accepted Answer

Facial nerve (CN VII)

Question 10

A patient is unable to abduct their eye laterally. Which cranial nerve is most likely damaged, and which muscle does it innervate?

Accepted Answer

Abducens nerve (CN VI); lateral rectus muscle

Question 11

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

Accepted Answer

Detects muscle tension and inhibits contraction to prevent injury

Question 12

Which of the following is a rapidly adapting (phasic) receptor, and what is its primary function?

Accepted Answer

Meissner's corpuscle; detects fine touch and low-frequency vibration

Question 13

Which equation best represents the rate of axonal regeneration in the peripheral nervous system?

Accepted Answer

$$v_{regen} = 1	ext{--}3\ 	ext{mm/day}$$

Question 14

Which spinal nerve root contains only sensory fibers, and what structure houses their cell bodies?

Accepted Answer

Dorsal root; dorsal root ganglion

Question 15

A patient with damage to the phrenic nerve would most likely experience which clinical consequence?

Accepted Answer

Difficulty breathing due to impaired diaphragm function

Question 16

Which of the following best describes the sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Action potential → calcium influx → acetylcholine release → sodium entry → muscle action potential → contraction

Question 17

Which reflex is monosynaptic and is commonly used to assess spinal cord integrity?

Accepted Answer

Patellar (knee-jerk) reflex

Question 18

Which neurotransmitter is primarily responsible for rapid pain transmission in the spinal cord?

Accepted Answer

Glutamate

Question 19

Which cranial nerve is the only one to extend into the thoracic and abdominal cavities, and what is its primary parasympathetic function?

Accepted Answer

Vagus nerve (CN X); regulates heart rate, breathing, and digestive activity

Question 20

Which of the following best describes the function of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

Breaks down acetylcholine to stop muscle stimulation and allow relaxation

Chapter 13 – The Peripheral Nervous System and Reflex Activity: Comprehensive Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards