Question

Nerve arising from abdominal ganglia in cockroach are found in
A. Abdomen
B. Thoracic muscles
C. Wings
D. Legs

Answer 1

Hint: The nervous system of the cockroach consists of a series of connected, segmentally organized ganglia, connected on the ventral side by paired longitudinal connections. Three ganglions are present in the thorax and six ganglions are present in the abdomen. The cockroach's nervous system is distributed across the body.

Complete answer:
The cockroach's central nervous system consists of supra-oesophageal or cerebral ganglia, esophageal circum connective and subesophageal ganglion. The suboesophageal ganglion is connected to the maxillae, mandibles and labium, and to other parts of the neck and head by three pairs of nerves. In each of the mesothoracic and metathoracic ganglia, six pairs of prothoracic ganglion nerves are present and five pairs innervate various parts of their respective sections. From each one of the first five abdominal ganglia, a single pair of nerves emerge in their respective sections to innervate muscles, spiracles, heart chambers and other portions. The first five are present in the initial five abdominal segments of the abdomen and the last is a little behind the sixth abdominal segment. Except for the sixth abdominal ganglion, which is created by the fusion of several ganglia and thus is the greatest in length. The thoracic and abdominal ganglia are formed by the merging of paired ganglia.


Hence, the correct answer is option (A).

Note: The peripheral nervous system is made up of nerves that originate from the ganglia of the central nervous system and connect to the periphery with different organs. A pair of optic and antennary nerves connect the eyes and antennas, respectively, emerge from the brain. Appendages, muscles and other structures are given off by the thoracic as well as the first five abdominal ganglia to paired segmental nerves.