And all the senses irradiate the brain. For the power of perception is supplied from it to the sense-organs via the nerves, and when it has been injured, the senses become inactive, as doctors prove. For when what is called the protector has been placed on the meninx, the animal becomes unconscious and motionless (the meninx is the membrane protecting the brain); and when the dorsal part (sc. of the brain) has been injured, the upper part of the subject enjoys perception, while feeling disappears in the lower parts, because the power of perception is no longer supplied from the brain, as the organ, i.e. the nerve, has been injured. And if the nerve was bound, feeling also disappears in the lower part but remains in the upper part. (Philoponus in DA 19,5-15)