- Earthworms have mechanorceptors, or touch sensors.
- It uses tactile hairs so that when it moves it stimulates nerve impulse.
- You can find light sense cells in the anterior and posterior segments.
- The cells that can detect moisture are the most sensitive which appear in the first segments, and earthworms seem to also have taste cells.
- For these nerves there are ganglia, body cells grouped together in clusters.
- Every segments has nerves that causes muscles to contract and receives impulses from sensory cells.
- The sensors are primarily single cells that detect light, chemicals, pressure waves and contact, and are present on the head, appendages (if any) and other parts of the body.