Brain's Parahippocampal Gyrus, Medial View

Description

Parahippocampal gyrus occupies the ventromedial surface of the temporal lobe, curving anteromedially to end in the uncus, the characteristic hook-like prominence at the anterior extremity. Along its superior margin, the gyrus lies immediately inferior to the hippocampal formation within the medial temporal lobe, with the hippocampal sulcus and fissural region separating cortical parahippocampal tissue from the dentate gyrus and hippocampus proper. Posteriorly, the parahippocampal gyrus narrows toward the isthmus that continues into the cingulate gyrus, linking limbic cortex around the splenial region. Spatial relationships are the point. Clinically, the uncus and adjacent parahippocampal cortex form a high-stakes neighborhood for mass effect and seizure localization: medial temporal lobe epilepsy commonly involves the parahippocampal gyrus and entorhinal area, while uncal herniation compresses the ipsilateral oculomotor nerve and can distort the posterior cerebral artery along the tentorial edge. The medial perspective makes it easier to teach how the anterior hook (uncus) sits superior and medial to the parahippocampal gyrus proper and why this region is discussed in relation to the ambient cistern and the brainstem. Memory circuitry becomes concrete when you can trace the parahippocampal region toward the cingulate isthmus in one continuous limbic arc. Neuroanatomy lecturers can pair this illustration with coronal MRI teaching to orient students to the parahippocampal gyrus, uncus, and hippocampal neighborhood when reading cases of hippocampal sclerosis or temporal lobe tumors. It also fits well in neurosurgical and neuroradiology publications describing medial temporal approaches and the clinical signs of uncal crowding. Anatomical accuracy verified by SciePro's Medical Advisory Board.