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Cockroach Nervous System Short Notes

In this article we will discuss about the cockroach nervous system

Cockroach Nervous System

Nervous system transmits signals between the brain and the rest of the body
Nervous system of cockroach can be divisible into three parts: central, peripheral and sympathetic system

Central nervous system

CNS consists of nerve ring and ventral nerve cord

Nerve ring

Supra-oesophageal ganglion is located in head region
From the supra oesophageal ganglia arise two circumoesophageal connectives
These tissues encircle oesophagus and meet below it with the sub oesophageal ganglion
Sub oesophageal ganglion is also situated in the head and formed by the fusion of 3 pairs of ganglia
They together constitute the nerve ring

Nerve cord

Paired, longitudinal, solid nerve cord is located on ventral side of body
Nerve cord has nine segmental ganglia
Three large ganglia in thorax and six in abdomen
Last ganglion is located in 7th abdominal segment

Peripheral Nervous System

Several nerves arises from CNS and innervate different part of body is called peripheral nervous system
Brain supplies paired nerves to eyes and antennae
Suboesophageal ganglia supplies paired nerves to mandibles, maxillae, and labium.

Autonomous System

It consists of 5 ganglia located on different parts of foregut and are inter-connected by nerves
It regulates peristalsis movement in foregut (involuntary activity)

Cockroach Sense organs

Proprioreceptors : they are for hearing or receiving sound vibrations. Auditory receptors are present on antenna and anal cerci.
Thigmoreceptors : they are receptors for touch. Thigmoreceptors are present on body, antenna, maxillary palps and legs.
Olfactory receptors : they receive various smells. Olfactory receptors are present on antenna
Gustatory receptors : they are for sense of taste. Gustatory receptors are present on maxilla and labial palps
Compound eyes: in cockroach vision is mosaic

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