Anatomical Presentation Of The Inferomedial Margin Of The Cerebral Hemisphere Of The Brain

Description

Inferomedial border of the cerebral hemisphere is defined here where the medial surface meets the basal (inferior) aspect, bringing the medial frontal lobe into continuity with the medial temporal and occipital lobes. Along this margin you would expect to see the gyrus rectus and olfactory sulcus anteriorly, transitioning posteriorly toward the parahippocampal gyrus and uncus, with the lingual gyrus and the region of the calcarine sulcus approaching the occipital pole. The cingulate gyrus lies superior to this junction on the medial surface, separated from the corpus callosum by the callosal sulcus. Midline dural relationships matter here. This anatomy is a frequent blind spot because many learners know the lateral sulci and lobes but struggle to anchor the medial and inferior cortical landmarks that define the limbic and visual cortices. The inferomedial temporal region, including the uncus and parahippocampal gyrus, is the clinical territory of uncal herniation, where medial temporal displacement can compress the oculomotor nerve in the tentorial notch and compromise the posterior cerebral artery, producing occipital infarction and contralateral homonymous hemianopia. An isolated, fixed view of the border clarifies how close cortical gray matter sits to the falx cerebri medially and the tentorium cerebelli inferiorly, an orientation that supports safe planning for subtemporal and interhemispheric approaches. Neuroanatomy and neurosurgery courses can pair this illustration with medial hemisphere dissections to teach the transition from frontal basal gyri to the medial temporal lobe and then to the medial occipital visual cortex. It also reads well in stroke and neurocritical care materials when explaining posterior cerebral artery infarcts and herniation syndromes using consistent surface landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.