Longitudinal Cerebral Fissure Of The Brain (Inferior View)

Description

Longitudinal cerebral fissure separates the right and left cerebral hemispheres along the midline on the basal (inferior) surface of the telencephalon. From this inferior perspective, the medial borders of the orbital surfaces of the frontal lobes and the inferomedial aspects of the temporal and occipital lobes frame the cleft, with the fissure extending anteroposteriorly toward the cerebellar tentorial region. The interhemispheric gap is the defining landmark. Peripheral basal landmarks commonly adjacent to this midline include the gyrus rectus and olfactory tract region anteriorly and the parahippocampal gyri more posteriorly, orienting the viewer to medial versus lateral cortex on the undersurface. Clinically, the longitudinal fissure matters because it is the corridor for interhemispheric surgical approaches and the compartment that houses the falx cerebri, a dural fold that can be involved in falcine meningiomas and can influence patterns of subdural hematoma spread across the midline. Appreciation of the fissure’s depth and the tight apposition of the hemispheric medial surfaces helps when teaching why lesions near the falx often present with leg-predominant motor or sensory deficits from medial precentral and postcentral gyri. Lighting and surface modeling in this fixed inferior orientation make the midline cleft easy to trace, which is useful when correlating gross anatomy with axial CT or MR images where the interhemispheric fissure is a routine reference for mass effect and midline shift. Neuroanatomy instructors can pair this illustration with basal brain lab material to reinforce telencephalic orientation terms and midline landmarks, and neurosurgery or neuroradiology texts can use it to introduce interhemispheric access routes and midline pathology localization. It also fits patient-facing educational pieces explaining why “midline shift” is assessed on head imaging after trauma or hemorrhage. Anatomical accuracy verified by SciePro's Medical Advisory Board.