Question 1

During embryonic development, the neural tube forms three primary brain vesicles. Which of the following sequences correctly describes the transformation from the neural tube to the major regions of the adult brain?

Accepted Answer

Neural tube → Prosencephalon, Mesencephalon, Rhombencephalon → Cerebrum, Diencephalon, Brainstem, Cerebellum

Question 2

Which of the following best describes the distribution of gray and white matter in the adult brain and spinal cord?

Accepted Answer

In the brain, gray matter is superficial and white matter is deep; in the spinal cord, gray matter is deep and white matter is superficial.

Question 3

A patient presents with a stroke affecting the precentral gyrus of the left cerebral hemisphere. Which functional area is most likely impaired, and what deficit would you expect?

Accepted Answer

Primary motor cortex; contralateral muscle weakness or paralysis

Question 4

Which of the following best differentiates commissural fibers from association and projection fibers in the cerebral white matter?

Accepted Answer

Commissural fibers connect corresponding gray areas of the two hemispheres, association fibers connect regions within the same hemisphere, and projection fibers connect the cerebrum with lower CNS centers.

Question 5

Which of the following is NOT a function of the basal nuclei?

Accepted Answer

Processing sensory input from the skin

Question 6

A patient with damage to the hypothalamus may experience disruptions in which of the following functions?

Accepted Answer

Regulation of body temperature, hunger, and endocrine activity

Question 7

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

Accepted Answer

It coordinates voluntary movements and maintains posture and balance.

Question 8

Which structure is primarily responsible for filtering sensory input and maintaining consciousness, and what is its main component?

Accepted Answer

Reticular formation; a network of neurons in the brainstem

Question 9

Which of the following correctly lists the order of the meninges from superficial to deep?

Accepted Answer

Dura mater → Arachnoid mater → Pia mater

Question 10

Which of the following best describes the production and circulation of cerebrospinal fluid (CSF)?

Accepted Answer

CSF is produced by the choroid plexuses, circulates through the ventricles, enters the subarachnoid space, and is absorbed into the venous blood via arachnoid granulations.

Question 11

A patient with a spinal cord injury at the level of T2 experiences paralysis of both lower limbs but retains function in the upper limbs. Which term best describes this condition?

Accepted Answer

Paraplegia

Question 12

Which of the following statements about the blood-brain barrier is correct?

Accepted Answer

It is formed by tight junctions between endothelial cells of CNS capillaries and astrocyte end-feet, restricting passage of many substances.

Question 13

Which of the following best differentiates upper motor neurons from lower motor neurons?

Accepted Answer

Upper motor neurons originate in the cerebral cortex or brainstem and synapse on lower motor neurons; lower motor neurons directly innervate skeletal muscles.

Question 14

Which of the following is a characteristic of spastic paralysis?

Accepted Answer

Increased muscle tone and exaggerated reflexes due to upper motor neuron damage

Question 15

Which of the following ascending tracts carries fine touch, vibration, and proprioceptive information to the brain?

Accepted Answer

Dorsal column-medial lemniscal pathway

Question 16

A patient is unable to form new memories after a traumatic brain injury. Which structure of the limbic system is most likely damaged?

Accepted Answer

Hippocampus

Question 17

Which of the following best describes the function of the thalamus?

Accepted Answer

It acts as a relay station for sensory information ascending to the cerebral cortex.

Question 18

Which of the following is a correct sequence for the flow of information in a typical ascending sensory pathway?

Accepted Answer

First-order neuron → Second-order neuron → Third-order neuron → Cerebral cortex

Question 19

Which of the following best describes the function of the corpus callosum?

Accepted Answer

It connects the left and right cerebral hemispheres, allowing communication between them.

Question 20

A patient with a lesion in the medulla oblongata would most likely experience which of the following symptoms?

Accepted Answer

Impaired regulation of heart rate and respiration

BIO-263 Chapter 12 Study Guide: Nervous System Structure and Function

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