Collateral and terminal
arborization and
synapse . Insect
nuerones release a variety of chemicals at synapses either to stimulate or to inhibit effector
neurones or muscles. Acetylcholine and catecholamines such as dopamine are the important
neurotransmitters involved in the impulse conduction. Neurones are of following types based on
structure and function.
A. Structural basis
i. Monopolar :
neurone with a single axon
ii. Bipolar
:
neurone with a proximal axon and a long distal dendrite.
iii. Multipolar :
neurone with a proximal axon and many distal dendrites.
B. Functional basis
i. Sensory neurone:
It conducts impulse from sense organs to cennervoussystem(CNS).
ii. Motor neurones:
It conducts impulse from CNS to effector organs
iii. Inter neurones:(association neurone:
It interlinks sensory and motor neurones.
Insect Morphology and Systematics
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The cell bodies of interneurones and motor neurones are aggregated with the fibres inter
connecting all types of nerve cells to form nerve centres called ganglia.
