In eutherian (placental) mammals, the hemispheres are linked by the corpus callosum, a very large bundle of nerve fibers.

[3] The interior portion of the hemispheres of the cerebrum includes the lateral ventricles, the basal ganglia, and the white matter.

[5] If the upper part of either hemisphere is removed, at a level about 1.25 cm above the corpus callosum, the central white matter will be exposed as an oval-shaped area, the centrum semiovale, surrounded by a narrow convoluted margin of gray substance, and studded with numerous minute red dots (puncta vasculosa), produced by the escape of blood from divided blood vessels.

[citation needed] If the remaining portions of the hemispheres be slightly drawn apart a broad band of white substance, the corpus callosum, will be observed, connecting them at the bottom of the longitudinal fissure; the margins of the hemispheres which overlap the corpus callosum are called the labia cerebri.

[6] Each labium is part of the cingulate gyrus already described; and the groove between it and the upper surface of the corpus callosum is termed the callosal sulcus.

The large expanse of medullary matter now exposed, surrounded by the convoluted margin of gray substance, is called the centrum semiovale.

[citation needed] Broad generalizations are often made in popular psychology about certain functions (e.g. logic, creativity) being lateralized, that is, located in the right or left side of the brain.

Function lateralization, such as semantics, intonation, accentuation, and prosody, has since been called into question and largely been found to have a neuronal basis in both hemispheres.

[11] Linear reasoning functions of language such as grammar and word production are often lateralized to the left hemisphere of the brain.

In contrast, holistic reasoning functions of language such as intonation and emphasis are often lateralized to the right hemisphere of the brain.