Question 1

Which of the following is NOT a principal function of the spinal cord?

Accepted Answer

Initiating voluntary movement in the limbs

Question 2

A patient suffers a complete transection of the spinal cord at the level of C4. Which of the following is the most immediate and life-threatening consequence?

Accepted Answer

Respiratory failure due to paralysis of the diaphragm

Question 3

Which region of the spinal cord is continuous with the medulla oblongata?

Accepted Answer

Cervical

Question 4

During a lumbar puncture, the needle is inserted into the subarachnoid space. At which vertebral level is this procedure typically performed in adults?

Accepted Answer

At or below L4

Question 5

Which of the following structures contains the cell bodies of sensory neurons entering the spinal cord?

Accepted Answer

Posterior root ganglion

Question 6

Which spinal cord region contains the greatest number of neurons innervating the lower limbs?

Accepted Answer

Lumbar enlargement

Question 7

Which of the following best describes the function of the posterior funiculus–medial lemniscal pathway?

Accepted Answer

Transmits signals for discriminative touch and proprioception

Question 8

A patient presents with a rash and burning pain along a single dermatome. Which condition is most likely responsible?

Accepted Answer

Shingles (Herpes Zoster)

Question 9

Which of the following is TRUE regarding the organization of white matter in the spinal cord?

Accepted Answer

The lateral funiculus contains both sensory and motor tracts

Question 10

Which of the following best describes a somatic reflex?

Accepted Answer

A quick, involuntary, stereotyped response involving skeletal muscle

Question 11

Which of the following is the correct order of structures penetrated during a lumbar puncture?

Accepted Answer

Skin → back muscles → ligamentum flavum → epidural space → dura mater → arachnoid mater → subarachnoid space

Question 12

Which of the following tracts is responsible for transmitting pain and temperature sensations to the brain?

Accepted Answer

Lateral spinothalamic tract

Question 13

Which of the following statements about spinal nerve plexuses is CORRECT?

Accepted Answer

The brachial plexus gives rise to nerves that innervate the upper limb

Question 14

Which of the following best describes the difference between upper and lower motor neurons in the motor pathway?

Accepted Answer

Upper motor neurons originate in the brain and synapse on lower motor neurons in the spinal cord or brainstem

Question 15

A patient cannot distinguish between a golf ball and a baseball by touch alone. Which pathway is most likely damaged?

Accepted Answer

Posterior funiculus–medial lemniscal pathway

Question 16

Which of the following best explains why spinal reflexes are faster than voluntary movements?

Accepted Answer

They do not require input from the brain

Question 17

Which of the following is TRUE regarding decussation in nervous system pathways?

Accepted Answer

It refers to the crossing of axons to the opposite side of the body

Question 18

Which of the following is a real-life example of referred pain due to dermatomal innervation?

Accepted Answer

Pain from a heart attack felt in the left arm

Question 19

Which of the following best describes the function of the spinocerebellar pathway?

Accepted Answer

Transmits subconscious proprioceptive information to the cerebellum

Question 20

Which of the following is the correct sequence of a typical somatic reflex arc?

Accepted Answer

Somatic receptors → afferent nerve fibers → integrating center → efferent nerve fibers → effector

The Spinal Cord and Spinal Nerves: Structure, Function, and Pathways

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