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neurons and the biochemistry of their interactions, we will begin to
put together a lasting map of the individual chemical and structural
components of behavior and will begin to see the beach.
h e neural system of insects is composed of the sensory receptors
that detect tactile (touch), olfactory (smell), gustatory (taste), and light
(vision) stimuli; interneurons that integrate electric signals from other
neurons; motor neurons (also called motoneurons) that af ect muscle
contractions; and synapses that connect neurons to each other. Neu-
rons are assembled into collectives called neuropils that form the ana-
tomical structures of the brain (Figure 5.13). Using neurotransmitters,
neurons within neuropils communicate with one another and with
neurons located in dif erent neuropils. Some neurotransmitters, such
as the biogenic amines, act as neuromodulators because they change
the transfer characteristics at synapses between neurons and because
Figure 5.13. Drawing of a worker bee brain viewed from the front showing
dif erent structures that represent major neuropils (collections of neurons) that
compartmentalize the brain.
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