Arthropod cuticle and hemolymph

The arthropod cuticle and hemolymph represent the primary structural and circulatory systems of insects, arachnids, and crustaceans, serving as critical interfaces for physiological regulation and chemical exposure. The cuticle is a complex, multi-layered exoskeleton composed primarily of chitin and various proteins, providing physical protection and serving as a barrier to desiccation and pathogens [1]. The hemolymph is the analogous fluid to vertebrate blood, circulating within the open circulatory system to transport nutrients, hormones, and immune cells (hemocytes) throughout the body [2]. In the context of pharmacology and toxicology, these systems are not single molecular targets but rather the physiological compartments that insecticides must penetrate or navigate to reach specific molecular sites, such as ion channels or enzymes [3]. Certain classes of chemicals, such as chitin synthesis inhibitors (e.g., benzoylureas), directly disrupt the formation of the cuticle during molting, while others are distributed via the hemolymph to reach the central nervous system [4]. Understanding the composition and permeability of the cuticle and the transport dynamics within the hemolymph is essential for the development of effective pesticides and veterinary treatments against ectoparasites [5].

Other names

Arthropod exoskeleton and circulatory fluidInsect cuticle and hemolymphArthropod integument and circulatory medium

Disruption of chitin synthesis and molting processes, or serving as a physiological medium for the systemic distribution of neurotoxic agents.