Question

What is nerve ring in earthworm ? ans plzz.

Answer 1

This arrangement means the brain, sub-pharyngeal ganglia and the circum-pharyngeal connectives form a nerve ring around the pharynx. The ventral nerve cord (formed by nerve cells and nerve fibres) begins at the sub-pharyngeal ganglia and extends below the alimentary canal to the most posterior body segment.

Answer 2

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In this manner the supra-pharyngeal ganglia (brain), sub-pharyngeal ganglia and the circum-pharyngeal connectives form a nerve ring around the pharynx. A ventral nerve cord arises from the sub-pharyngeal ganglia and runs below the alimentary canal upto the posterior most body segment.
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