White matter of spinal cord is made up of:
Correct answer: B. Myelinated nerve fibres
- A. Sensory nerve fibres
- B. Myelinated nerve fibres
- C. Motor nerve fibres
- D. Mixed nerve fibres
Explanation
White matter is found in the deeper tissues of the brain (subcortical). It contains nerve fibres (axons), which are extensions of nerve cells (neurons). Many of these nerve fibres are surrounded by a type of sheath or covering called myelin. Myelin gives the white matter its colour.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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