Q: Which of the following equations correctly represents the calculation of total CSF volume if the rate of CSF production is $$0.35\ \mathrm{ml/min}$$ and the average turnover time is $$6\ \mathrm{hours}$$?

$$0.35\ \mathrm{ml/min} \times 60\ \mathrm{min/hour} \times 6\ \mathrm{hours}$$

Question 1

Which of the following is NOT a function of cerebrospinal fluid (CSF) in the central nervous system?

Accepted Answer

Transmits motor impulses from the brain to muscles

Question 2

CSF is primarily formed in which structure of the brain?

Accepted Answer

Choroid plexuses

Question 3

A patient presents with paralysis of all four limbs after a spinal cord injury. Which term best describes this condition?

Accepted Answer

Quadriplegia

Question 4

Which cells are responsible for the production of CSF in the choroid plexus?

Accepted Answer

Ependymal cells

Question 5

The blood-brain barrier is mainly formed by which of the following features?

Accepted Answer

Epithelial cells joined by tight junctions

Question 6

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

Accepted Answer

Alcohol

Question 7

A lumbar puncture (spinal tap) is performed to collect CSF. Which meningeal layer must the needle pass through LAST before reaching the CSF?

Accepted Answer

Pia mater

Question 8

Which region of the spinal cord is responsible for the emergence of nerves that supply the upper limbs?

Accepted Answer

Cervical enlargement

Question 9

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

Accepted Answer

It is shaped like the letter 'H' and contains neuronal cell bodies

Question 10

Which spinal cord tract carries sensory information from the body to the brain?

Accepted Answer

Ascending tract

Question 11

A patient suffers a stroke that blocks blood flow to a region of the brain. What is the medical term for this event?

Accepted Answer

Cerebrovascular accident

Question 12

Which of the following is TRUE regarding the amount of CSF present in the CNS at any one time?

Accepted Answer

There is only 100–160 ml present

Question 13

Which of the following equations correctly represents the calculation of total CSF volume if the rate of CSF production is $$0.35\ \mathrm{ml/min}$$ and the average turnover time is $$6\ \mathrm{hours}$$?

Accepted Answer

$$0.35\ \mathrm{ml/min} 	imes 60\ \mathrm{min/hour} 	imes 6\ \mathrm{hours}$$

Question 14

Which of the following best describes the function of the dorsal horns in the spinal cord?

Accepted Answer

Consist of interneurons involved in sensory processing

Question 15

Which of the following pathways is responsible for carrying general somatic sensory impulses to the brain?

Accepted Answer

Spinothalamic pathway

Question 16

If a patient loses sensation but retains motor function after a spinal cord injury, which term best describes their condition?

Accepted Answer

Parasthesia

Question 17

Which of the following is a direct motor pathway that delivers instructions from the brain to the spinal cord?

Accepted Answer

Pyramidal tract

Question 18

Which structure attaches the spinal cord to the coccyx inferiorly?

Accepted Answer

Filum terminale

Question 19

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

Accepted Answer

It is composed of myelinated and nonmyelinated axons

Question 20

Which equation would you use to estimate the number of spinal cord segments if you know the total number of spinal nerves is $$n$$ and each segment gives rise to one pair of nerves?

Accepted Answer

$$n$$

Central Nervous System: Cerebrospinal Fluid (CSF) and Its Role

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