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Everyday we rely on our five senses taste touch seeing hearing and smelling These are simple processes that we have accepted as part of our lives However the process which lets our body actually use these senses is not so simple In this paper I will look at the ways which the nervous system and the brain work together to produce our senses Seeing The Light Humans are intensely visual animals The eyes send millions of nerve signals every second for analysis interpretation and recording The nerve signals represent energy transformed or transducer from the energy in light rays Inside the eye light rays pass through the cornea and then the pupil in the center of the iris The fixed cornea and adjustable lens bend light rays to focus a clear image onto the retina As with an equivalent man-made lens the image is inverted But since this is the case from birth we never know any different and so it is not a problem The retina has two types of light sensitive cells- rods and cones The 125 million rods detect shades of black and white The 5-7 million cones detect color and fall into 3 types each of which is most sensitive to one of the primary colors of light red blue and green Most cones are in the center of the retina especially in the fovea- a rod-free area where vision is the sharpest Rods and some cones are found in the rest of the retina Greenfield 197 Each rod cell is about 150-200 micrometers long at one end next to a layer of pigment cells and facing the outside of the eyeball it has a stack of disks studded with the chemicals
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