The effect of fenoxycarb on neurosecretion cells of silkworm Bombyx mori during 5. instar larval period

The insect brain is a secretory organ with a central role in the regulation of growth and development. Brain in insects (cerebral ganglion) is composed of two lobes and exists on the esophagus in head. Neurosecretin cells have in the lateral and median regions of brain. These cells, which are the top regulatory centers of the hormone system consist secretion. In this study, we investigated effect of fenoxycarb on neurosecretion cells of silkworm Bombyx mori during 5. instar larval period. A juvenile hormone analog fenoxycarb is used for many different control of insect pests. Brains removed with dissection, stained with hemotoxylen&eosine and paraldehyde fuchsine (PAF) for histological examination. As a result of stains three types of cells were detected. They are NSH-1, NSH-2 and NSH-3. Both the cells on different days and the cells of the administration and control groups were found to have secretory differences.