Introduction Larval Brain All animals use chemical messengers prothoracic secretory to requlate cellular activity. These In Insects brain hormone With a high level messengers are controls the brain of juvenile hormones. Hormones hormone hormone. larval stages. occ are transported dyson through the body and bind to receptors of Ecdysone brings aboul Larval their target cells molt and Stages Insect brain hormone maturation stimulates a gland in the thorax that produces a steroid With a low hormone necessary level of juvenile for molting and hormone, maturation occurs Without uvenile OCCUTS Adult Insect