The nerve cord of Pheretima bifurcates in which segments to form a nerve ring?
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a
3rd and 4th segments
b
5th and 6th segments
c
1st and 2nd segments
d
2nd and 3rd segments
answer is A.
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Detailed Solution
The nerve cord of Pheretima bifurcates in 3rd and 4th segments to form a nerve ring. In Pheretima the circumpharyngeal nerve ring is formed by the combination of suprapharyngeal ganglia, subpharyngeal ganglia and circumpharyngeal connectives.