Question 1

Which of the following best describes the function of the spinal cord in the central nervous system?

Accepted Answer

It provides two-way communication between the brain and body and serves as a major reflex center.

Question 2

A lumbar puncture is typically performed between which vertebrae, and why is this site chosen?

Accepted Answer

Between L3 and L4 or L4 and L5, because the spinal cord ends at L1 or L2, reducing risk of injury.

Question 3

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

Accepted Answer

Filum terminale

Question 4

What is the primary function of the dorsal horns in the spinal cord gray matter?

Accepted Answer

They contain interneurons that receive somatic and visceral sensory input.

Question 5

Which of the following best describes the organization of white matter in the spinal cord?

Accepted Answer

It is divided into dorsal, lateral, and ventral columns (funiculi), each containing ascending and descending tracts.

Question 6

Which pathway transmits discriminative touch and vibration sensations to the somatosensory cortex?

Accepted Answer

Dorsal column–medial lemniscal pathway

Question 7

A patient loses the ability to feel pain and temperature on the right side of their body below the waist. Which spinal tract is most likely damaged?

Accepted Answer

Left lateral spinothalamic tract

Question 8

Which of the following is TRUE regarding the organization of neuronal pathways in the spinal cord?

Accepted Answer

Pathways are paired symmetrically, and most exhibit decussation.

Question 9

Which of the following best describes the difference between direct (pyramidal) and indirect (extrapyramidal) descending pathways?

Accepted Answer

Direct pathways regulate fast, skilled movements; indirect pathways regulate balance, posture, and coarse limb movements.

Question 10

Which tract is responsible for transmitting information about muscle or tendon stretch to the cerebellum for coordination of muscle activity?

Accepted Answer

Spinocerebellar tract

Question 11

A patient presents with loss of voluntary fine motor control but retains posture and balance. Which descending tract is most likely damaged?

Accepted Answer

Lateral corticospinal tract

Question 12

Which of the following is NOT a function of the reticulospinal and vestibulospinal tracts?

Accepted Answer

Regulating head, neck, and eye movements in response to visual stimuli

Question 13

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

Accepted Answer

It contains cell bodies of sensory neurons entering the spinal cord.

Question 14

Which meningeal layer is directly attached to the surface of the spinal cord?

Accepted Answer

Pia mater

Question 15

Which of the following is TRUE regarding the central canal of the spinal cord?

Accepted Answer

It is filled with cerebrospinal fluid (CSF).

Question 16

Which of the following best explains why the spinal cord has cervical and lumbar enlargements?

Accepted Answer

These regions are where nerves supplying the limbs exit the spinal cord.

Question 17

Which of the following is a correct sequence for the three-neuron chain in ascending sensory pathways?

Accepted Answer

First-order neuron → Second-order neuron → Third-order neuron

Question 18

Which of the following best describes the process of decussation in spinal tracts?

Accepted Answer

The crossing of nerve fibers from one side of the CNS to the other.

Question 19

Which of the following tracts is responsible for mediating head movements in response to visual stimuli?

Accepted Answer

Tectospinal tract

Question 20

A patient with a lesion in the ventral horn of the spinal cord would most likely experience which of the following symptoms?

Accepted Answer

Loss of somatic motor function below the level of the lesion

The Spinal Cord: Structure, Function, and Pathways (CNS Part B)

Study Guide - Practice Questions