Here are some bits you should know in a simple glossary.
- The brain stem is the bit of your brain that is obviously an extension of your spinal cord. It is not divided into 'left' and 'right' sections like the rest of the brain. On a side view of a human brain you can see just a little bit of the brain stem sticking out the bottom like the stem of a cauliflower, but it carries on up inside almost to the centre of the brain, and indeed incorporates some (or all) of what is usually called the mid-brain or mesencephalon.
- The cerebral cortex (confusingly often just called cortex) is the folded 'cauliflower' bit that is the most visible feature of a human brain. It is a sheet that isn't very thick (cortex is from the latin for 'bark' of trees) and in humans it is around 4mm thick. It is divided into the left and right hemispheres although these are joined in various places by large, fast, bundles of connections. It is the 'greyest' part of the brain indicating that its connections are dense and mostly very short-range.
- The next bit of interest, the diencephelon, refers to most of the bits that you cannot see from the outside (because they are covered by the cortex) and which are joined to the top of the brain stem and the mid-brain. If you turn the brain to look directly up the brain stem, you can catch a glimpse of part of the diencephalon.
- An obvious feature of the human brain is the cerebellum. It is almost like a separate little brain that sticks prominently out of the back of a human brain and is joined to the brain stem. Its surface is folded - more narrowly folded than the cerebral cortex - and consists of a single sheet of tissue in a folded arrangement like an accordion.
Part of: Martin’s Vastly Oversimplified and Woefully Incomplete Guide to Everything in the Brain as featured on the Brainsex website.