Question

How are the Cytons and Axons of neurons arranged in the following? (a) Cerebrum
(b) Spinal Cord

Answer 1

The arrangement of cytons (cell bodies) and axons in the nervous system differs between the cerebrum and the spinal cord.

(a) Cerebrum

The outer region of the cerebrum is called the cerebral cortex.

• The cytons (cell bodies of neurons) are located in the outer layer of the cerebrum.
• This outer region forms the grey matter.
• The axons are present in the inner region.
• This inner region forms the white matter.

\( \text{Cerebrum: Outer grey matter (cytons) + Inner white matter (axons)} \)

(b) Spinal Cord

In the spinal cord, the arrangement is the opposite of that in the cerebrum.

• The cytons are located in the central region.
• This central part forms the grey matter and appears H-shaped.
• The axons are located in the outer region.
• This outer region forms the white matter.

\( \text{Spinal Cord: Inner grey matter (cytons) + Outer white matter (axons)} \)

Final Answer

• (a) Cerebrum: Cytons are present in the outer grey matter, while axons form the inner white matter.
• (b) Spinal Cord: Cytons form the inner grey matter, while axons form the outer white matter.