Question

In the central nervous system, myelinated fibres form the .........., while the non-myelinated fibre cells form the

• A. Grey matter, white matter
• B. White matter, grey matter
• C. Ependymal cells, neurosecretory cells
• D. Neurosecretory cells, ependymal cells

Answer 1

The correct option is B White matter, grey matter

• White matter is a component of the central nervous system, in the brain and spinal cord.
• The white matter is placed on the grey matter in the brain while it lies outer to the grey matter in the spinal cord.
• It consists mainly of nerve fibers with their myelin sheaths. It transmits signals from one region of the cerebrum to another and between the cerebrum and lower brain centers.
• In contrast, the darker tissue of the brain and spinal cord, consisting mainly of non-myelinated nerve cell bodies and branching dendrites is the grey matter.
• The function of grey matter is to route sensory or motor stimuli to interneurons of the CNS in order to create a response to the stimulus through chemical synapse activity.

Thus, the correct answer is option B.