Question 1

Which structure marks the inferior end of the spinal cord, where it tapers before giving rise to the cauda equina?

Accepted Answer

Conus medullaris (medullary cone)

Question 2

A patient presents with loss of sensation and motor function in the anterior thigh. Which nerve plexus is most likely affected?

Accepted Answer

Lumbar plexus

Question 3

During a lumbar puncture, cerebrospinal fluid is withdrawn from the subarachnoid space. Why is this procedure typically performed below vertebra L2?

Accepted Answer

The spinal cord ends at L1-L2, reducing risk of injury

Question 4

Which of the following best describes the function of the posterior (dorsal) horn of the spinal cord?

Accepted Answer

It processes incoming sensory information

Question 5

Which layer of the meninges is in direct contact with the spinal cord and is rich in blood vessels?

Accepted Answer

Pia mater

Question 6

A patient has difficulty breathing due to paralysis of the diaphragm. Which nerve and plexus are most likely involved?

Accepted Answer

Phrenic nerve, cervical plexus

Question 7

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

Accepted Answer

Lateral columns contain both ascending and descending tracts

Question 8

Which anatomical feature connects the two sides of gray matter in the spinal cord and contains the central canal?

Accepted Answer

Gray commissure

Question 9

A patient suffers a lesion that damages the anterior (ventral) root of a spinal nerve. Which function is most likely lost?

Accepted Answer

Transmission of motor commands to skeletal muscles

Question 10

Which of the following best describes the cauda equina?

Accepted Answer

A bundle of spinal nerves extending below the conus medullaris

Question 11

Which of the following is the correct order of the meninges from superficial to deep?

Accepted Answer

Dura mater, arachnoid mater, pia mater

Question 12

Which spinal nerve emerges between the seventh cervical vertebra and the first thoracic vertebra?

Accepted Answer

C8

Question 13

Which region of the spinal cord contains the lateral horn, and what is its primary function?

Accepted Answer

Thoracic and upper lumbar regions; sympathetic autonomic function

Question 14

A patient has a herniated disc compressing the posterior root of a spinal nerve. Which symptom is most likely?

Accepted Answer

Loss of sensation in the affected area

Question 15

Which nerve plexus gives rise to the sciatic nerve, the largest nerve in the body?

Accepted Answer

Sacral plexus

Question 16

Which of the following best describes the function of ascending tracts in the spinal cord?

Accepted Answer

Carry sensory information from the periphery to the brain

Question 17

A patient with meningitis is most likely to show which of the following symptoms due to inflammation of the meninges?

Accepted Answer

Hearing loss, confusion, and severe headache

Question 18

Which anatomical feature is responsible for anchoring the spinal cord to the coccyx?

Accepted Answer

Filum terminale

Question 19

Which of the following best explains why the cervical and lumbar regions of the spinal cord are enlarged?

Accepted Answer

They have increased neural structures for limb innervation

Question 20

Which of the following is TRUE regarding the organization of spinal nerves and their relationship to the vertebral column?

Accepted Answer

Cervical nerves C1-C7 emerge above their vertebrae, but C8 emerges below C7

Central Nervous System: The Spinal Cord – Structure, Function, and Nerve Plexuses

Study Guide - Practice Questions