In the context of the cerebral hemispheres, a split brain occurs due to:

severance of the corpus callosum.

Explanation:

The corpus callosum is a white-colored brain structure that connects the two hemispheres (right and left) of human brains. This connection established by the corpus callosum is extremely important, as the two hemispheres work together. It is due to the separation of the corpus callosum that we can see that the brain is divided into two hemispheres.

The corpus callosum is formed by several bundles of communication neural fibers (set of axons and dendrites). It is located in the central region of the human brain, where these beams pass from side to side.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

i think it is true in my reasonment ..