Question 1

Which of the following best explains why white matter appears white and gray matter appears gray in the spinal cord when viewed microscopically?

Accepted Answer

White matter contains a high concentration of myelinated axons, which reflect light, while gray matter contains mostly neuron cell bodies and unmyelinated fibers.

Question 2

A patient suffers a lesion that destroys the dorsal root of a spinal nerve. Which function would most likely be lost as a result?

Accepted Answer

Transmission of sensory information from the periphery to the spinal cord.

Question 3

Which of the following best describes a 'nucleus' in the context of the central nervous system?

Accepted Answer

A cluster of neuron cell bodies located within the CNS.

Question 4

Which of the following accurately describes the difference between ascending and descending tracts in the spinal cord?

Accepted Answer

Ascending tracts carry sensory information to the brain, while descending tracts carry motor commands from the brain to the body.

Question 5

Which of the following correctly matches a protective structure of the spinal cord with its description?

Accepted Answer

The dura mater is the tough, outermost membrane surrounding the spinal cord.

Question 6

A patient steps on a sharp object and immediately withdraws their foot. Which sequence best describes the pathway of this withdrawal reflex?

Accepted Answer

Pain receptor → sensory neuron → interneuron in spinal cord → motor neuron → skeletal muscle contraction

Question 7

Which of the following is NOT a correct classification of reflexes?

Accepted Answer

Ascending vs. descending

Question 8

Which structure is NOT part of the brainstem?

Accepted Answer

Thalamus

Question 9

The cardiovascular and respiratory centers are located in which part of the brainstem?

Accepted Answer

Medulla oblongata

Question 10

Which of the following best describes the function of Purkinje cells in the cerebellum?

Accepted Answer

They integrate sensory and motor information to coordinate smooth, precise movements.

Question 11

A patient with Parkinson’s disease is experiencing tremors and difficulty initiating movement. Which structure is most directly implicated in these symptoms, and why?

Accepted Answer

The substantia nigra, due to decreased dopamine production affecting motor control.

Question 12

Which of the following is a primary function of the thalamus?

Accepted Answer

Relaying sensory information to the appropriate regions of the cerebral cortex.

Question 13

Which of the following best describes the role of the hypothalamus?

Accepted Answer

It regulates homeostatic functions such as temperature, hunger, and endocrine activity.

Question 14

Which of the following is NOT a bone that protects the brain?

Accepted Answer

Clavicle

Question 15

Which statement best describes the organization of gray and white matter in the cerebrum?

Accepted Answer

Gray matter forms the outer cortex, while white matter lies beneath it.

Question 16

Which class of axons in the white matter of the cerebrum connects the left and right cerebral hemispheres?

Accepted Answer

Commissural fibers

Question 17

Which of the following best describes the difference between cortex regions and association regions in the cerebrum?

Accepted Answer

Cortex regions are involved in primary sensory or motor functions, while association regions integrate and interpret information.

Question 18

Damage to the precentral gyrus would most likely result in which of the following deficits?

Accepted Answer

Loss of voluntary motor control on the contralateral side of the body.

Question 19

Which of the following best describes the function of the postcentral gyrus?

Accepted Answer

It serves as the primary somatosensory cortex, processing touch, pressure, pain, and temperature.

Question 20

A patient is unable to integrate sensory information from multiple sources to recognize an object by touch alone (astereognosis). Which brain region is most likely damaged?

Accepted Answer

Somatic sensory association area

ANP Exam 6 Study Guide: Spinal Cord, Brainstem, and Brain Organization

Study Guide - Practice Questions

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