Two Hemispheres

Of the obviously so many different ways of zoning the human brain for study purposes,
we will take up only a few of them as samples. As briefly mentioned before, a fully
matured brain has three major parts. Of these the largest is the cerebrum. It covers around
¾ of the brain size. In terms of its outer structure, it is covered with numerous folds, and
has a color of purple and gray blended. The cerebrum is formed by two cerebral
hemispheres, accordingly called the right and the left hemisphere, that are separated by a
groove, the medial longitudinal fissure. Between the two hemispheres, there is a bundle of nerve fibers that connects the two sides, almost serving like connecting rope holding
the two in place. Called corpus callosum, if this were to be cut into two, the two
hemispheres would virtually become two separate entities. Just as there are two
hemispheres, that look broadly like mirror images to each other, on the two sides,
likewise many of the brain parts exist in pairs, one on each side. However, due to the
technological advances in general, and that of the MRI, in particular, it has been shown
that, on average, brains are not as symmetrical in their left-right structure as was once
believed to be , almost like mirror images.