Cones distinguish colours, but are not so sensitive to light as rods, which is why we do not see colours well at night. There are three kinds of cone, one sensitive to red light, one to blue and one to green. There are touch receptors all over the body. Smell seems to rely on a small patch of olfactory receptors inside the top of your nose. The olfactory receptors react to traces of different chemicals in the air.
Taste is a mixture of different sensations, including smell.
Your tongue has an array of different taste receptors, which react to sweet, salty, bitter and sour tastes in food. Sweet detectors are commonest at the tip of the tongue, salty just behind on either side, sour and bitter further back. Inside your head, in the middle ear , sounds hit a taut wall of skin called the eardrum , shaking it rapidly. As it shakes, it rattles three tiny bones or ossicles . Even further inside, in the inner ear, is a curly tube full of fluid called the cochlea .