Pineapple sea cucumbers have a simple radial nervous system that consists of a modified nerve net consisting of interconnecting neurons with no centralbrain. The nerves radiate from central rings around the mouth along the body wall; the branches of these nerves coordinate the movements of the organism and the synchronisation of the tube feet. The Cucumber Sea Cucumbers have no particular sense organs but do have statocysts that assist in gravitational orientation. They also have sensory cells in their epidermis, particularly in the tube feet, spines, and pedicellariae.