Nervous System of Cockroach

Nervous System of Cockroach

It consists of:

1. Central Nervous System
2. Peripheral Nervous System
3. Sympathetic or Visceral System

1. Central Nervous System: It consists of brain or supra oesophageal ganglion. Brain gives off a pair of short, stout cords, the circumoesophageal connectives, that encircle the oesophagus and pass downwards and backwards over the suboephageal ganglion situated below oesophagus.
   
   From the sub esophageal ganglion passes backwards into the thorax, a double ventral nerve-cord, which bears three ganglia in the thorax and six in the abdomen.
   
2. Peripheral Nervous System: It consists of nerves, which are given off from the ganglia so as to innervate all the parts of the body.
   
3. Sympathetic or Stomatogastric Visceral Nervous System: It consists of a frontal ganglion, which is situated on the dorasl side of the oesophagus in the head. From this ganglion, a median unpaired recurrent nerve reaches the visceral ganglion situated on the crop. Various nerve branches are given off from the visceral ganglion.
   
   The frontal ganglion is jointed with the central nervous system by nerves, which connect the circumoesophageal commissures.