Corpus Callosum, Posterior View

Description

Centered deep to the posterior cerebral hemispheres, the corpus callosum forms the dominant interhemispheric commissure, with its posterior thickening, the splenium, spanning between the right and left occipital regions. From this posterior viewpoint, the cerebral hemispheres frame the midline, while the thalamus sits superior to the midbrain and just rostral to the pons, creating a clear dorsal relationship between diencephalon and brainstem. Inferior and posterior to the brainstem, the cerebellar hemispheres and vermis occupy the posterior cranial fossa, their folia contrasting with the broader gyri and sulci of the cerebral cortex. Small segments of cranial nerves emerge from the brainstem, most apparent around the pontomedullary junction and lateral medulla. A posterior emphasis on the splenium matters because it is a frequent site where you correlate commissural anatomy with disconnection syndromes and focal lesions. Infarction in the posterior cerebral artery territory can extend into the splenium and adjacent retrosplenial region, producing alexia without agraphia when left occipital involvement blocks visual information from reaching left-hemisphere language networks via callosal fibers. This view also helps orient trainees to why posterior fossa masses can distort midline structures, with upward pressure on the brainstem and secondary effects on thalamic position and cranial nerve function. Neurology and neuroanatomy courses use this perspective to teach commissures, posterior circulation stroke patterns, and brainstem-cerebellar relationships without the cognitive load of a full sectioned atlas plate. Medical publishers can pair it with MR imaging figures (axial or sagittal) to anchor the splenium, thalamus, and brainstem in three-dimensional space for radiology primers, stroke chapters, and neurosurgical orientation pages. Anatomical accuracy verified by SciePro's Medical Advisory Board.