8th Mr. Wright Central Nervous System Quiz Science Mishael

What is the primary component of white matter?

• Capillary blood vessels

• Neuronal cell bodies

• Myelinated axon fibers

• Unmyelinated axon fibers

Answer explanation

The primary component of white matter is myelinated axon fibers, which are responsible for transmitting signals between different parts of the brain and spinal cord.

That was a lot of information! I have one last question for you: What do we find in the dorsal root ganglion?

• Cell bodies of sensory neurons

• Cell bodies of motor neurons

• Axons of sensory neurons

• Axons of motor neurons

Answer explanation

The dorsal root ganglion contains the cell bodies of sensory neurons, which transmit sensory information to the central nervous system.

Do you remember the medulla's function? What would be the most likely symptom of a patient who was hit hard in the head and suffered an injury to the medulla?

• Loss of speech

• Irregularity in breathing

• Numbness in lower limbs

• Loss of coordinated movements

Answer explanation

Injury to the medulla can cause irregularity in breathing, making it the most likely symptom after a head injury.

Do you remember which lobe processes the sensory information coming from the hand?

• Parietal lobe

• Occipital lobe

• Temporal lobe

• Frontal lobe

Answer explanation

The parietal lobe processes sensory information from the hand. It is responsible for interpreting touch, pressure, temperature, and pain sensations.

Which area was affected when Dr. Alex couldn't form long sentences?

• Insula

• Prefrontal cortex

• Wernicke's

• Broca's

Answer explanation

Dr. Alex couldn't form long sentences due to damage in the Broca's area, which is responsible for speech production.

Well done! Remember, Dr. Alex had difficulties with speaking. Can you tell now which area of the brain controls the complex ability to speak, so we can investigate it a bit more?

• Cerebrum

• Pons

• Cerebellum

• Hypothalamus

Answer explanation

The cerebrum controls the complex ability to speak. It is the correct choice because Dr. Alex had difficulties with speaking.

If an infection slowly destroys cells in the ventral gray horns- Which symptoms do you expect to show up?

• Loss of memory

• Complete loss of motor functions

• Muscle weakness and atrophy

• Loss of sensory and motor functions

Answer explanation

If an infection slowly destroys cells in the ventral gray horns, muscle weakness and atrophy are expected symptoms. This choice is correct because it directly relates to the destruction of cells in the ventral gray horns.