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- #Class 11
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In earthworm, nerve ring lies in
Option: 1
2nd segment
Option: 2
4th segment
Option: 3
1st segment
Option: 4
7th segment
Answers (1)
As we learned
Structure of CNS in earthworm -
It is ring like structure which lies around the pharynx in 3rd and 4th segment. It has 3 parts
a) Suprapharyngeal ganglio or cerebral ganglia lies dorsally in the 3rd segment.
b) Peripharyngeal or circumpharyngeal connectives lies in 3rd and 4th segments.
c) Sub Pharyngeal ganglia, lies in 4th segment.
-
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