Question 1

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

Accepted Answer

It carries sensory and motor information between the brain and most other parts of the body.

Question 2

A patient presents with a loss of sensation in a specific region of skin on the anterior thigh. Which structure is most likely affected?

Accepted Answer

A dermatome associated with the lumbar plexus.

Question 3

Which meningeal layer is directly attached to the surface of the spinal cord and contains blood vessels supplying the cord?

Accepted Answer

Pia mater

Question 4

During a lumbar puncture (spinal tap), cerebrospinal fluid is withdrawn from which space?

Accepted Answer

Subarachnoid space

Question 5

Which of the following best explains why the cervical and lumbosacral enlargements of the spinal cord are wider than other regions?

Accepted Answer

They supply nerves to the limbs, requiring more gray matter for processing.

Question 6

A reflex arc typically follows which sequence of events?

Accepted Answer

Receptor → Sensory neuron → CNS → Motor neuron → Effector

Question 7

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

Accepted Answer

Gray matter is deep and integrates information, while white matter is superficial and carries information.

Question 8

A person steps on a sharp object and quickly withdraws their foot while simultaneously shifting their weight to the other leg. Which neural circuit patterns are involved in this response?

Accepted Answer

Divergence and crossed extensor reflexes

Question 9

Which of the following statements about spinal nerves is correct?

Accepted Answer

They are formed by the union of anterior and posterior roots and are mixed nerves.

Question 10

Which of the following best describes the function of the phrenic nerve?

Accepted Answer

It controls the diaphragm and is essential for breathing.

Question 11

A patient with carpal tunnel syndrome is most likely to experience symptoms due to compression of which nerve?

Accepted Answer

Median nerve

Question 12

Which of the following is a characteristic of polysynaptic reflexes?

Accepted Answer

They involve pools of interneurons and can activate muscles in multiple areas.

Question 13

Which of the following best explains the difference between the plantar reflex and the Babinski reflex?

Accepted Answer

The plantar reflex is normal in adults, while the Babinski reflex is normal in infants.

Question 14

Which of the following best describes the role of the Golgi tendon organ in the tendon reflex?

Accepted Answer

It inhibits muscle contraction to prevent excessive tension and tendon damage.

Question 15

Which connective tissue layer surrounds individual axons within a peripheral nerve?

Accepted Answer

Endoneurium

Question 16

Which of the following neural circuit patterns allows a single sensory stimulus to produce multiple simultaneous responses, such as shifting weight, lifting a foot, and yelling in pain?

Accepted Answer

Parallel processing

Question 17

A patient is unable to extend their wrist and fingers. Which nerve of the brachial plexus is most likely damaged?

Accepted Answer

Radial nerve

Question 18

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

Accepted Answer

It is a bundle of nerve roots extending below the conus medullaris.

Question 19

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

Accepted Answer

It contains axons of motor neurons.

Question 20

Which of the following is a real-life example of an acquired reflex?

Accepted Answer

Braking a car quickly in response to an obstacle.

Chapter 13: The Spinal Cord, Spinal Nerves, and Spinal Reflexes – Study Guide

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