Response in lnsects
Insects are part of the phylum Arthropod and like the annelids, arthropods have a prominent brain and ventral nerve cord. the latter contains segmentally arranged ganglia
Compared to the earthworm, the insect’s nervous system is more centralised, with extensive fusion of ganglia in the head and ventral nerve cord. An insect’s brain is divided into two main parts, each controlling a limited spectrum of activities within the insect’s body.
The first part, consisting of six fused ganglia located within the head capsule, controls important areas such as the eyes, antennae and mouth parts. Other major concentrations of ganglia are located along the ventral nerve cord and these usually control the body functions closest to it. For example, locomotion is controlled by three pairs of thoracic ganglia in the thorax which innervate the legs and wings.