Question

why the last ganglia in cockroach is situated in 7th abdominal segment but not in 6th​

Answer 1

Answer:

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Explanation:

From the sub-oesophageal ganglion arises a double nerve cord which travels through the thorax and abdomen below the alimentary canal on the ventral side up to the posterior end of the body. ... Each ganglion of the nerve cord is formed by the fusion of two ganglia except the ganglion in the 7th segment.

Answer 2

Answer:

From the sub-oesophageal ganglion arises a double nerve cord which travels through the thorax and abdomen below the alimentary canal on the ventral side up to the posterior end of the body. ... Each ganglion of the nerve cord is formed by the fusion of two ganglia except the ganglion in the 7th segment.