Question 1

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts passage of certain substances from the blood into the brain, allowing glucose and some fat-soluble molecules to pass.

Question 2

A patient presents with abnormal accumulation of cerebrospinal fluid (CSF) in the brain's ventricles. What is the most likely diagnosis?

Accepted Answer

Hydrocephalus

Question 3

Which meningeal layer is most closely associated with the surface of the brain, following its contours and containing many small blood vessels?

Accepted Answer

Pia mater

Question 4

Which of the following is NOT a function of cerebrospinal fluid (CSF)?

Accepted Answer

Transmitting electrical impulses between neurons

Question 5

A lumbar puncture is typically performed below which vertebral level to avoid damaging the spinal cord?

Accepted Answer

L1 or L2

Question 6

Which of the following statements about the organization of spinal cord gray matter is correct?

Accepted Answer

The lateral horns are present in the thoracic and superior lumbar regions and contain sympathetic motor neurons.

Question 7

Which of the following best explains why damage to a single spinal nerve does not usually result in complete paralysis of a limb muscle?

Accepted Answer

Nerve plexuses redistribute fibers from different spinal nerves, so each muscle receives input from multiple nerves.

Question 8

Which cranial nerve is responsible for the majority of parasympathetic output to the thoracic and abdominal viscera?

Accepted Answer

Vagus nerve (X)

Question 9

A patient has lost the ability to abduct their eyeball. Which cranial nerve is most likely damaged?

Accepted Answer

Abducens nerve (VI)

Question 10

Which of the following best describes the composition of a peripheral nerve?

Accepted Answer

A bundle of myelinated and nonmyelinated axons surrounded by connective tissue layers: endoneurium, perineurium, and epineurium.

Question 11

Which of the following substances can cross the blood-brain barrier most easily?

Accepted Answer

Fat-soluble molecules such as O$$_2$$, CO$$_2$$, and alcohol

Question 12

Which of the following is a correct sequence for the flow of cerebrospinal fluid (CSF)?

Accepted Answer

Produced by choroid plexus → ventricles → subarachnoid space → absorbed by arachnoid villi

Question 13

Which of the following is true regarding the dorsal and ventral roots of the spinal cord?

Accepted Answer

Both are part of the peripheral nervous system (PNS).

Question 14

A patient presents with loss of sensation in a specific area of skin. This area is most likely innervated by which of the following?

Accepted Answer

A dermatome

Question 15

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

Accepted Answer

It is organized into dorsal, lateral, and ventral columns (funiculi) containing ascending, descending, and transverse tracts.

Question 16

Which of the following is a property of most spinal tracts?

Accepted Answer

They exhibit decussation, relay, somatotopy, and symmetry.

Question 17

Which nerve is the major motor and sensory nerve of the diaphragm, and what is a common clinical sign of its irritation?

Accepted Answer

Phrenic nerve; hiccups

Question 18

Which cranial nerve is responsible for facial expression and also carries taste sensation from the anterior two-thirds of the tongue?

Accepted Answer

Facial nerve (VII)

Question 19

Which of the following best describes the function of arachnoid granulations (villi)?

Accepted Answer

They absorb cerebrospinal fluid into the dural venous sinuses.

Question 20

Which of the following equations best represents the relationship between the rate of CSF production, volume, and replacement time in the brain?

Accepted Answer

$$	ext{Rate of CSF production} = \frac{	ext{Volume of CSF}}{	ext{Replacement time}}$$

Protection and Organization of the Nervous System: Meninges, CSF, Blood-Brain Barrier, and Spinal Cord

Study Guide - Practice Questions