fixation: (histology) the preservation and hardening of a tissue sample to retain as nearly as possible the same relations they had in the living body
process: a sustained phenomenon or one marked by gradual changes through a series of states
dictyoptera: in some classifications replaced by the orders (here suborders) Blattodea (cockroaches) and Manteodea (mantids); in former classifications often subsumed under a much broader order Orthoptera