Q: Which equation best represents the arrangement of neurons in a typical ascending sensory pathway?

$$\text{First-order neuron} \rightarrow \text{Second-order neuron} \rightarrow \text{Third-order neuron}$$

Question 1

Which of the following best describes the function of the basal ganglia in the cerebrum?

Accepted Answer

They cooperate with the cerebral cortex to calculate and control voluntary movements, including starting, stopping, and regulating movement intensity.

Question 2

A patient presents with slow, jerky movements and difficulty initiating voluntary actions. Which structure is most likely affected?

Accepted Answer

Basal ganglia (substantia nigra)

Question 3

Which type of cerebral white matter tract connects the left and right hemispheres of the brain?

Accepted Answer

Commissural fibers

Question 4

The cerebrospinal fluid (CSF) is primarily produced by which structure?

Accepted Answer

Choroid plexuses in the ventricles

Question 5

Which meningeal layer is the strongest and forms the outermost covering of the brain?

Accepted Answer

Dura mater

Question 6

A lumbar puncture (spinal tap) is performed to collect cerebrospinal fluid. Into which space is the needle inserted?

Accepted Answer

Subarachnoid space below $$L_1$$/$$L_2$$

Question 7

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

Accepted Answer

Transmits motor impulses from the brain to muscles

Question 8

Which equation best represents the number of spinal nerve pairs in humans?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Question 9

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

Accepted Answer

It is formed by tight junctions between capillary endothelial cells and astrocytes.

Question 10

Damage to the dorsal horn neurons of the spinal cord would most likely result in loss of which function?

Accepted Answer

Sensory perception such as touch and pain

Question 11

Which pathway carries non-discriminative sensations such as pain and temperature?

Accepted Answer

Spinothalamic pathway

Question 12

Which of the following best explains why the spinal cord is anchored in place?

Accepted Answer

By the filum terminale and denticulate ligaments, which are extensions of the pia mater

Question 13

Which of the following is a direct motor pathway that controls precise and skilled voluntary movements?

Accepted Answer

Pyramidal (corticospinal) tract

Question 14

A patient with quadriplegia has suffered an injury to which region of the spinal cord?

Accepted Answer

Cervical region

Question 15

Which of the following structures is responsible for allowing cerebrospinal fluid to pass from the subarachnoid space into the dural venous sinuses?

Accepted Answer

Arachnoid granulations (villi)

Question 16

Which equation best represents the arrangement of neurons in a typical ascending sensory pathway?

Accepted Answer

$$	ext{First-order neuron} ightarrow 	ext{Second-order neuron} ightarrow 	ext{Third-order neuron}$$

Question 17

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

Accepted Answer

Gray matter is found in the inner region, shaped like an 'H', while white matter surrounds it.

Question 18

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

Accepted Answer

It allows communication between the two cerebral hemispheres.

Question 19

Which of the following clinical conditions is associated with the absence of vertebral lamina and can result in neural tube defects?

Accepted Answer

Spina bifida

Central Nervous System: Structure, Function, and Protection

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