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| Central Nervous System |
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| The nervous system in cockroach, though not as advanced as the human nervous system, has the three main divisions - the central nervous system, peripheral nervous system and the sympathetic nervous system. |
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| Nervous System of Cockroach |
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| The central nervous system consists of two parts |
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| Circum-oesophageal nerve ring |
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| It is entirely situated in the head region. It is ring-like structure around the oesphagus. It consists of the following |
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| Supra-oesophageal ganglion |
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| It is also called the brain or the cerebral ganglion. It is a bilobed structure that is present dorsal to the oesophagus. It carries out the sensory functions. |
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| Circum-oesphageal connective |
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| From the brain, arise two connectives that encircle the oesophagus and ventrally connect to the sub-oesophageal ganglion. |
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| Sub-oesophageal ganglion |
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| It is present ventral to the oesopohagus. From this ganglion arises the nerve cord that passes through the length of the body. It controls the movements of the muscles, mouthparts, wings and legs. |
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| Ventral Nerve cord |
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| It is a solid, double nerve cord that passes along below the alimentary canal till the end of the body. It has nine ganglia along its length. The first three are the thoracic ganglia and the next six are the abdominal ganglia. The thoracic ganglia are big and situated one in each thoracic segment. The abdominal ganglia are present in the 1st, 2nd, 3rd, 4th, 5th and 7th segments. Of these the 7th segment ganglia is the largest. |
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