But let the optic nerve be inert, the sensory and
motor connections broken between brain and hand, or foot and trunk, or
brain and trunk, and the hand or foot may be amputated and the mind
never sense the fact; the trunk may be severely injured and the mind be
serenely unconscious. So the brain in man is "the one immediate bodily
condition of the mental operations." Take away all the brain and man's
body is a useless mass of protoplasm.
The brain's varied and intricate nerve connections with all parts of the
body, through nerves branching from the main trunks in the spinal cord,
we shall not discuss, for you know them through your study of anatomy.
For the purpose of our psychology we need consider only two of the main
divisions of the brain--the _cerebrum_, which includes what we call the
right and left hemispheres, and the _cerebellum_.
THE CEREBRUM OR FOREBRAIN
For convenience the various lobes of the cerebrum are known as frontal,
temporal, parietal, and occipital, according to the parts of the brain
referred to: as forehead, temples, crown, or occiput.
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