Q: Which equation best represents the spatial mapping of the body in the primary motor cortex (homunculus)?

$$\text{Area}_{ ext{motor cortex}} \propto \text{Fine motor control}$$

Q: Which equation describes the relationship between the volume of cerebrospinal fluid (CSF) in the ventricles and the rate of reabsorption by arachnoid granulations?

$$\text{Volume}_{\text{CSF}} = \text{Production rate} - \text{Reabsorption rate}$$

Q: Which equation best represents the relay of sensory information from the skin to the somatosensory cortex?

$$\text{Skin} \xrightarrow{\text{First-order neuron}} \text{Spinal cord/medulla} \xrightarrow{\text{Second-order neuron}} \text{Thalamus} \xrightarrow{\text{Third-order neuron}} \text{Somatosensory cortex}$$

Question 1

Which embryonic structure gives rise to the central nervous system, and what is its orientation from rostral to caudal?

Accepted Answer

The neural tube, oriented from rostral (forehead) to caudal (spinal cord)

Question 2

During embryonic development, which primary brain vesicle forms the adult cerebrum?

Accepted Answer

Prosencephalon

Question 3

Which adult brain structure is derived from the diencephalon?

Accepted Answer

Thalamus

Question 4

What is the basic pattern of gray and white matter distribution in the CNS, and how does it change as you ascend from the spinal cord to the cerebrum?

Accepted Answer

White matter surrounds a central cavity of gray matter in the spinal cord, but in the cerebrum and cerebellum, gray matter forms an outer cortex with islands of gray matter within white matter

Question 5

Which lobe of the cerebral hemisphere is primarily responsible for voluntary motor control, and which gyrus initiates this movement?

Accepted Answer

Frontal lobe; precentral gyrus

Question 6

A patient suffers a stroke affecting the left primary motor cortex. Which side of the body will be paralyzed, and why?

Accepted Answer

Right side, because each hemisphere controls the contralateral side of the body

Question 7

Which structure connects the two cerebral hemispheres and allows for communication between them?

Accepted Answer

Corpus callosum

Question 8

Which type of fiber tract connects different parts of the same cerebral hemisphere?

Accepted Answer

Association fibers

Question 9

Which ventricle is located in the diencephalon, and how is it connected to the lateral ventricles?

Accepted Answer

Third ventricle; via interventricular foramen

Question 10

Which area of the cerebral cortex is responsible for conscious awareness of sensation from the skin and proprioceptors, and where is it located?

Accepted Answer

Primary somatosensory cortex; postcentral gyrus

Question 11

Which pathway transmits discriminative touch and vibration to the somatosensory cortex?

Accepted Answer

Dorsal column–medial lemniscal pathway

Question 12

What is the function of the spinocerebellar tracts?

Accepted Answer

Convey information about muscle or tendon stretch to the cerebellum for coordination

Question 13

Which meningeal layer is the strongest and forms partitions that limit excessive movement of the brain?

Accepted Answer

Dura mater

Question 14

Which meningeal layer contains cerebrospinal fluid and the largest blood vessels of the brain?

Accepted Answer

Arachnoid mater

Question 15

A patient has damage to the Broca’s area. What deficit would you expect?

Accepted Answer

Impaired speech production

Question 16

Which equation best represents the spatial mapping of the body in the primary motor cortex (homunculus)?

Accepted Answer

$$	ext{Area}_{	ext{motor cortex}} \propto 	ext{Fine motor control}$$

Question 17

Which equation describes the relationship between the volume of cerebrospinal fluid (CSF) in the ventricles and the rate of reabsorption by arachnoid granulations?

Accepted Answer

$$	ext{Volume}_{	ext{CSF}} = 	ext{Production rate} - 	ext{Reabsorption rate}$$

Question 18

Which brain region is primarily responsible for visual-spatial skills, intuition, and artistic abilities?

Accepted Answer

Right hemisphere

Question 19

If a patient has impaired spatial discrimination and cannot localize touch stimuli, which area of the brain is most likely damaged?

Accepted Answer

Primary somatosensory cortex

Question 20

Which equation best represents the relay of sensory information from the skin to the somatosensory cortex?

Accepted Answer

$$	ext{Skin} \xrightarrow{	ext{First-order neuron}} 	ext{Spinal cord/medulla} \xrightarrow{	ext{Second-order neuron}} 	ext{Thalamus} \xrightarrow{	ext{Third-order neuron}} 	ext{Somatosensory cortex}$$

Central Nervous System: Structure, Development, and Functional Organization

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