Question 1

Which cranial nerve is primarily responsible for transmitting visual information from the retina to the brain, and where does it originate?

Accepted Answer

The optic nerve (Cranial Nerve II); originates at the retina of the eye.

Question 2

A patient presents with loss of sensation and motor function in the anterior thigh. Damage to which plexus and major nerve is most likely responsible?

Accepted Answer

Lumbar plexus; femoral nerve

Question 3

Which of the following best describes the formation of a typical spinal nerve?

Accepted Answer

It is formed by the union of a dorsal root (sensory) and a ventral root (motor).

Question 4

How many pairs of spinal nerves are found in the human body, and how are they distributed by region?

Accepted Answer

31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal

Question 5

A person suffers a penetrating injury to the neck and loses the ability to breathe independently. Which nerve and plexus are most likely damaged?

Accepted Answer

Phrenic nerve; cervical plexus

Question 6

Which of the following is the correct order of events in a simple human reflex arc, such as the patellar reflex?

Accepted Answer

Receptor → sensory neuron → integration center → motor neuron → effector

Question 7

Which major nerve arises from the brachial plexus and is commonly compressed in carpal tunnel syndrome?

Accepted Answer

Median nerve

Question 8

If a patient cannot dorsiflex the foot and has numbness on the lateral aspect of the leg, which nerve and plexus are likely involved?

Accepted Answer

Common fibular (peroneal) nerve; sacral plexus

Question 9

Which cranial nerve is responsible for most parasympathetic output to the thoracic and abdominal organs?

Accepted Answer

Vagus nerve (Cranial Nerve X)

Question 10

A patient presents with wrist drop after a humeral fracture. Which nerve and plexus are most likely affected?

Accepted Answer

Radial nerve; brachial plexus

Question 11

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

Accepted Answer

It carries sensory (afferent) information into the spinal cord.

Question 12

Which spinal nerve plexus is formed by the ventral rami of C5–T1 and gives rise to the nerves that innervate the upper limb?

Accepted Answer

Brachial plexus

Question 13

A person is unable to extend the knee and has decreased sensation over the anterior thigh. Which nerve is most likely damaged?

Accepted Answer

Femoral nerve

Question 14

Which cranial nerve is responsible for facial expression and also carries taste sensations from the anterior two-thirds of the tongue?

Accepted Answer

Facial nerve (Cranial Nerve VII)

Question 15

Which of the following equations best represents the relationship between the number of spinal nerves ($$N$$), the number of vertebral regions ($$R$$), and the average number of nerves per region ($$\bar{n}$$)?

Accepted Answer

$$N = R 	imes \bar{n}$$

Question 16

Which nerve is most likely to be injured in a pelvic fracture, resulting in loss of function to the posterior thigh and all muscles below the knee?

Accepted Answer

Sciatic nerve

Question 17

Which cranial nerve is responsible for hearing and balance, and what is its number?

Accepted Answer

Vestibulocochlear nerve (Cranial Nerve VIII)

Question 18

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

Accepted Answer

Glossopharyngeal nerve (Cranial Nerve IX)

Question 19

Which of the following best describes the function of the ventral ramus of a spinal nerve?

Accepted Answer

It supplies the anterior and lateral trunk and the limbs.

Question 20

Which nerve is at risk of injury during improper use of crutches, leading to 'crutch palsy' and wrist drop?

Accepted Answer

Radial nerve

Peripheral Nervous System: Structure, Function, and Lab Objectives

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