Question 1

Which structure marks the tapering end of the spinal cord, and at which vertebral levels does it typically terminate?

Accepted Answer

Conus medullaris; terminates between T12-L3

Question 2

A patient suffers a spinal cord injury at the level of C4. Which of the following best describes the expected clinical outcome?

Accepted Answer

Quadriplegia, paralysis in all four limbs

Question 3

Which of the following statements about the cauda equina is correct?

Accepted Answer

It consists of lumbar and sacral nerve roots traveling inferiorly before exiting the vertebral canal

Question 4

During a lumbar puncture (spinal tap), why is the needle typically inserted between L3-L4 or L4-L5?

Accepted Answer

To avoid damaging the conus medullaris, which ends above these levels

Question 5

Which layer of the spinal meninges is directly attached to the surface of the spinal cord and follows all its contours?

Accepted Answer

Pia mater

Question 6

Which of the following best describes the function of the direct (pyramidal) descending pathway?

Accepted Answer

Controls voluntary movement via long axons from the primary motor cortex

Question 7

A patient receives epidural anesthesia during childbirth. Which anatomical space is targeted for the injection?

Accepted Answer

Extradural (epidural) space

Question 8

Which of the following is TRUE regarding the organization of spinal gray matter?

Accepted Answer

It is divided into four zones: somatic sensory, visceral sensory, visceral motor, and somatic motor

Question 9

Which of the following best explains why the spinal cord is shorter than the vertebral column in adults?

Accepted Answer

The vertebral column grows faster than the spinal cord during development

Question 10

Which of the following is a consequence of transection of the spinal cord at any level?

Accepted Answer

Total motor and sensory loss inferior to the site of damage

Question 11

Which of the following correctly matches the spinal cord enlargement with the region it innervates?

Accepted Answer

Cervical enlargement: upper limbs

Question 12

Which of the following is the correct sequence for the three-neuron pathway in ascending sensory tracts?

Accepted Answer

First-order neuron in ganglion, second-order in dorsal horn, third-order in thalamus

Question 13

Which of the following is a function of the indirect (extrapyramidal) descending pathway?

Accepted Answer

Regulates balance, posture, and head/eye movements

Question 14

Which of the following statements about spinal nerves is correct?

Accepted Answer

There are 31 pairs of spinal nerves, each formed by the union of dorsal and ventral roots

Question 15

Which of the following best describes the role of cerebrospinal fluid (CSF) in the spinal cord?

Accepted Answer

CSF fills the subarachnoid space and cushions the spinal cord against trauma

Question 16

A virus destroys somatic neurons in the ventral horn of the spinal cord. Which disease is most likely responsible?

Accepted Answer

Poliomyelitis

Question 17

Which equation best represents the number of spinal nerve pairs in humans?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Question 18

Which of the following is a real-world application of the knowledge of dermatomes?

Accepted Answer

Identifying the location of a spinal cord injury based on sensory loss patterns

Question 19

Which of the following procedures involves traversing both the dura mater and arachnoid mater to obtain a sample?

Accepted Answer

Lumbar spinal puncture (spinal tap)

Question 20

Which anatomical feature is responsible for securing the spinal cord to the dura mater?

Accepted Answer

Denticulated ligaments

A: Central Nervous System: Part 2

Study Guide - Practice Questions