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In this section we'll first take a brief look at the shape of the brain and its main parts, then we'll look at the cavity that contains it and the layers of tissue that surround it, then we'll return to the brain itself and look at it in more detail.

Here's the brain. Much the largest part of the brain is the cerebrum. The cerebrum is partly divided in the mid-line into two cerebral hemispheres. Below the cerebrum and separate from it is the smaller cerebellum. The cerebrum and the cerebellum both grow out of the brainstem. The brainstem becomes continuous below with the spinal cord.