Question

Which of the following statement is correct regarding distribution of ganglia in cockroaches?

• A. Six ganglia lie in the head region, three in thorax and six in abdomen.
• B. Six ganglia lie in the thorax, and three in the abdomen.
• C. Four ganglia lie in the thorax, and seven in the abdomen.
• D. Three ganglia lie in the thorax, and six in the abdomen.

Answer 1

Answer: (D)

The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side. Three ganglia lie in the thorax, and six in the abdomen. The nervous system of cockroach is spread throughout the body.