Nervous System CNS and PNS · NCERT Biology

The cerebral cortex is referred to as 'Gray Matter' because of the:

  1. Presence of myelin sheaths on axon fibers
  2. Concentration of neuron cell bodies
  3. High blood supply to cortical neurons
  4. Presence of cerebrospinal fluid in sulci
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Correct answer: Concentration of neuron cell bodies

The cerebral cortex appears gray because it is densely packed with neuron cell bodies, which lack the white fatty myelin found on axons. Myelinated fibers constitute the inner 'white matter'.

Difficulty: Medium Question 11 of 20

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