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B
Nerve cells
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C
Nerve fibres
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D
Nissl granules
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Solution
The correct option is B Nerve cells The grey matter refers to that part of the neuron which is not surrounded by the myelin sheath. The nerve cells or the cyton or the soma along with the dendrites are not covered with the myelin sheath. So they constitute the grey matter.
A. Ependymal cells are the glial cells present in the choroid plexus that take part in the formation of the cerebrospinal fluid.
B. Nerve cells form the grey matter.
C. If nerve fibres myelinated they will form the white matter.
D. Nissl granules are the ribosomes present in the nerve cell.