It contains double series of nerve centres (ganglia). These nerve centres (ganglia) are
connected by longitudinal tracts of nerve fibres called
connectives and transverse tracts of nerve
commissures . Central nervous system is made up of the following.
(i).Brain: Formed by the fusion of first three cephalic neuromeres.
Large, innervate compound eyes and ocelli.
Found beneath protocerebrum, innervate antennae.
Bilobed, innervate labrum.
Functions: i. Main sensory centre controls insect behaviour.