Cockroach Nervous System

Nervous system of cockroach  

The nervous system of cockroach is ganglionated type. Various ganglionic mass located at different regions of body.

The nervous system of cockroach is studied into two part.

1.        Central nervous system

2.        Peripheral nervous system.

1.     Central nervous system consists of supra-oesophageal  ganglia, sub- oesophageal ganglia and ventral nerve cord.

2.     The supra-oesophageal ganglia lies on dorsal side of oesophagous in head. The sub-pharyngeal ganglia lies on ventral side of oesophagus.

3.     The supra- oesophageal ganglia and sub- oesophageal ganglia are connected by transvers connection called as circum-oesophageal connective.  

4.     Ventral nerve cord is formed by a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives beneath the alimentary canal ventrally.   

5.     The ventral nerve cord consist of 9 segmental ganglia.

6.     First three ganglia are large, lies in thorax and remaining six are abdominal ganglia.

7.     supra-oesophageal ganglion supplies nerves to antennae and compound eyes.

8.     Each abdominal ganglion control the respective segment. 
9. Last or 6^th ganglia is much larger formed by the fusion of 5 pairs of ganglia control last six segment