Question 1

Which meningeal layer is most closely adhered to the surface of the spinal cord and contains extensions that help anchor the cord against side-to-side movement?

Accepted Answer

Pia mater

Question 2

A patient presents with severe muscle wasting, flaccid paralysis, and absent reflexes in the lower limbs. Which type of neurological lesion is most likely present?

Accepted Answer

Lower Motor Neuron (LMN) lesion

Question 3

During a lumbar puncture, why is the needle inserted below the level of L2?

Accepted Answer

To avoid damaging the conus medullaris, as the solid cord ends above this level

Question 4

Which structure in the spinal cord cross-section is responsible for processing and integrating sensory and motor information?

Accepted Answer

Gray matter (inner core)

Question 5

A positive Babinski sign (toes fan upward) in an adult is most indicative of which condition?

Accepted Answer

Upper motor neuron lesion

Question 6

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

Accepted Answer

Carries only sensory data into the cord

Question 7

What is the primary clinical significance of nerve plexuses in the peripheral nervous system?

Accepted Answer

They provide structural redundancy, reducing the risk of complete paralysis from a single spinal injury

Question 8

Which step in the 5-step reflex arc involves the direct activation of a motor neuron without brain input?

Accepted Answer

Step 4: Motor Neuron

Question 9

In the context of spinal cord injuries, what is the main difference between spinal shock and cauda equina syndrome?

Accepted Answer

Spinal shock involves acute paralysis and loss of reflexes in the solid cord, while cauda equina syndrome involves root compression below L2 with saddle anesthesia and bladder/bowel symptoms

Question 10

Which horn of the spinal cord gray matter is responsible for issuing commands to the autonomic (sympathetic) nervous system?

Accepted Answer

Lateral horn (T1–L2 only)

Question 11

A patient steps on a nail and experiences a withdrawal reflex in the injured leg. What is the effect on the supporting leg, and what is this reflex called?

Accepted Answer

The supporting leg extends; this is the crossed extensor reflex

Question 12

Which of the following best explains why the brain is compared to a 'CEO' and the spinal cord to a 'regional headquarters'?

Accepted Answer

The brain issues high-level commands, while the spinal cord executes rapid, automatic responses

Question 13

Which clinical finding is most consistent with an upper motor neuron lesion?

Accepted Answer

Hyperreflexia and spasticity

Question 14

What is the role of the gamma motor neuron in the monosynaptic stretch reflex?

Accepted Answer

It adjusts the sensitivity of the muscle spindle to stretch

Question 15

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

Accepted Answer

It contains myelinated axons organized into tracts for communication

Question 16

A patient with a spinal cord lesion above L2 presents with complete loss of reflexes and flaccid paralysis in the acute phase. What is this condition called?

Accepted Answer

Spinal shock

Question 17

Which of the following is a correct sequence for the 5-step reflex arc?

Accepted Answer

Stimulus & Receptor → Sensory Neuron → Integration → Motor Neuron → Effector Response

Question 18

Which clinical sign is used to distinguish between upper and lower motor neuron lesions?

Accepted Answer

Babinski sign

Question 19

Which of the following best describes the function of the dorsal horn in the spinal cord?

Accepted Answer

Receives incoming sensory data from the body

The Human Spinal Cord: Structure, Function, and Clinical Correlates

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