Where can I find further information on the energy centers?

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I have been wondering about what I call 'secondary energy centers' for lack of a better term. I was trying to focus on different parts of my body during meditation last night and here's what I came up with:

-The feet seem to contain red-ray energy centers related to the ability to draw energy from the Earth.
-The knees . . . I'm not too sure but my gut tells me they might be related to orange-ray.
-The shoulders seem to me to be related to orange-ray energies as well, I get the image of someone's shoulders drawing in protectively when they are sad or frightened and pulling back so that the chest can puff out when they are confident.
-The elbows I'm not too sure about either but I get a feeling of yellow-ray energies from them.
-The hands have indigo-ray energy centers in the palm. This is related to the ability to both draw in and send out energies as well as the ability to make manifest that which we see in the mind's eye.
-In the temples I feel energy related to the blue-ray. When I focus on them I feel my mind expanding laterally, maybe these help increase cognitive functions?

I'd love to hear what others have to say about these or other possible energy centers in the body.