The Chiton's nervous system is very primitive. Neurons are simply scattered along the length of nerve cords. A nerve ring surrounds the buccal cavity and subradular organ. A posterior nerve ring gives rise to a pair of pedal nerve chords, which innervate the foot muscle. A large pair of pallial visceral nerve chords completes the nerve ring.
Some families do have specialized eyes called the aesthetes.
These are mantle sensory cells that penetrate the articulamentum of the shell and are lodged within vertical canals leading to the outside of the shell. In some chitons these are only tactile sensory organs. Most chitons are herbivorous - feeding on unicellular and multicellular algae. They scrape this alga off of the rocks and other substrates on which they live, by means of their hard, raspy radular ribbon. The mouth is located at the anterior end, in front of the foot and opens into a buccal cavity containing the radula - and a smaller, more ventral subradular sac that in turn contains a sensory structure.