Quote:
Originally Posted by DuckieTigger
The spinal cord is simply transmitting signals to and from the brain. The spinal cord doesn't think, it just does. The retina, on the other hand, has actual thinking cells inside, five layers of them. Those five layers of signal processing should impress you by the sheer amount of processing that can be done...
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Technically the brain comprises of the brain stem (the smallest part of the brain, located beneath it), the cerebellum (located lower rear of the brain) and cerebrum (the main mass of the brain). It does not include the retina, but you can add any part of your anatomy to it that you like.