Difference between nervous system of cockroach and earthworm
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Central Nervous System of Cockroach:
The central nervous system consists of the supra-oesophageal ganglion or brain, sub- oesophageal ganglion and the nerve cord.
The supra-oesophageal ganglion or cerebral ganglion is a bilobed structure situated in the head in front of oesophagus, above the tentorium and almost between the bases of the antennae. It is formed by the fusion of three pairs of ganglia. It represents the brain and is concerned chiefly with sensory function.
The ocelli are sensitive to light and are connected to the cerebral ganglia. Generally, the flatworm avoids light. The nervous system of the earthworm is "segmented" just like the rest of the body. The "brain" is located above the pharynx and is connected to the first ventral ganglion.
The central nervous system consists of the supra-oesophageal ganglion or brain, sub- oesophageal ganglion and the nerve cord.
The supra-oesophageal ganglion or cerebral ganglion is a bilobed structure situated in the head in front of oesophagus, above the tentorium and almost between the bases of the antennae. It is formed by the fusion of three pairs of ganglia. It represents the brain and is concerned chiefly with sensory function.
The ocelli are sensitive to light and are connected to the cerebral ganglia. Generally, the flatworm avoids light. The nervous system of the earthworm is "segmented" just like the rest of the body. The "brain" is located above the pharynx and is connected to the first ventral ganglion.
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Sex - earthworms are hermaphrodites (monoecious) while cockroaches are diecious (male or female)
Respiration - oxygen is absorbed passively through the moist skin of the earthworm while gas diffusion takes place through the spiracles of the cockroach
Nervous System - worms have a central nerve cord while cockroaches have a ventral nerve cord
Locomotion - worms use circular and longitudinal muscles with setae covering the body. Cockroaches use legs and wings to move
Digestive System - the worms digestive tract is straight and simple. the cockroaches is curved and more developed
Skeleton - worms have a hydrostatic skeleton to assist with movement under the soil however cockroaches have an exoskeleton for protection and to avoid drying out
Respiration - oxygen is absorbed passively through the moist skin of the earthworm while gas diffusion takes place through the spiracles of the cockroach
Nervous System - worms have a central nerve cord while cockroaches have a ventral nerve cord
Locomotion - worms use circular and longitudinal muscles with setae covering the body. Cockroaches use legs and wings to move
Digestive System - the worms digestive tract is straight and simple. the cockroaches is curved and more developed
Skeleton - worms have a hydrostatic skeleton to assist with movement under the soil however cockroaches have an exoskeleton for protection and to avoid drying out
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