Question 1

A patient presents with difficulty breathing due to paralysis of the diaphragm. Which nerve is most likely damaged, and from which plexus does it arise?

Accepted Answer

Phrenic nerve from the cervical plexus

Question 2

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

Accepted Answer

It carries motor commands away from the spinal cord.

Question 3

A lesion in the posterior horns of the spinal cord would most likely affect which function?

Accepted Answer

Sensory processing

Question 4

Which structure anchors the spinal cord to the coccyx, providing longitudinal support?

Accepted Answer

Filum terminale

Question 5

A patient cannot abduct their arm at the shoulder and has lost sensation over the deltoid region. Which nerve is most likely injured?

Accepted Answer

Axillary nerve

Question 6

Which of the following cranial nerves is purely sensory and responsible for the sense of smell?

Accepted Answer

Olfactory nerve (CN I)

Question 7

During a lumbar puncture, the needle passes through several layers. Which layer is immediately deep to the dura mater?

Accepted Answer

Arachnoid mater

Question 8

Which nerve is responsible for flexion of the forearm at the elbow and arises from the brachial plexus?

Accepted Answer

Musculocutaneous nerve

Question 9

A patient presents with loss of sensation and movement in the lower limbs, but the upper limbs are unaffected. Which region of the spinal cord is most likely damaged?

Accepted Answer

Lumbar enlargement

Question 10

Which of the following best describes the function of the dorsal root ganglion?

Accepted Answer

It contains cell bodies of sensory neurons.

Question 11

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

Accepted Answer

Vagus nerve (CN X)

Question 12

Which of the following is the correct order of connective tissue layers from innermost to outermost in a peripheral nerve?

Accepted Answer

Endoneurium, perineurium, epineurium

Question 13

Which of the following best describes the cauda equina?

Accepted Answer

A bundle of spinal nerve roots extending below the conus medullaris

Question 14

A patient has difficulty extending their wrist and fingers after a humeral fracture. Which nerve is most likely injured?

Accepted Answer

Radial nerve

Question 15

Which cranial nerve is responsible for hearing and balance?

Accepted Answer

Vestibulocochlear nerve (CN VIII)

Question 16

Which space contains cerebrospinal fluid (CSF) in the spinal cord?

Accepted Answer

Subarachnoid space

Question 17

Which of the following nerves is a major branch of the sacral plexus and is the largest nerve in the body?

Accepted Answer

Sciatic nerve

Question 18

Which cranial nerve is primarily responsible for tongue movement?

Accepted Answer

Hypoglossal nerve (CN XII)

Question 19

A patient presents with loss of sensation on the medial side of the hand and difficulty with finger abduction. Which nerve is most likely affected?

Accepted Answer

Ulnar nerve

Question 20

Which of the following best describes the function of Schwann cells in peripheral nerves?

Accepted Answer

They form the myelin sheath around axons.

Spinal Cord, Cranial Nerves, and Spinal Nerves: Structure and Function

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