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