... 3.2) Juvenile hormone is a terpenoid compound (Figure 13. 6A) and, to date, six naturally occurring forms (JH-O, JH-I, 4-methyl-JH-I, JH-II, JH-III, and JHB3 ) have been identified In all insects ... osmoregulation (Chapter 18, Section 5); ovarian ecdysiotropic hormone (OEH) (formerly egg development neurosecretory hormone) (Chapter 19, Section 3.1.3); ovulation- or oviposition-inducing hormone (Chapter ... INTEGRATION 412 CHAPTER 13 FIGURE 13. 5 Cross-section to show major areas of brain [After R F Chapman, 1971, The Insects: Structure and Function By permission of Elsevier/North-Holland, Inc.,...