Postcentral Gyrus Of The Brain, Lateral View

Description

Postcentral gyrus occupies the parietal lobe immediately posterior to the central sulcus, forming the primary somatosensory cortex (S1) on the lateral convexity of the cerebral hemisphere. From this fixed lateral perspective, the gyrus appears as a vertically oriented cortical fold bounded anteriorly by the central sulcus and posteriorly by the postcentral sulcus, with the superior segment approaching the superomedial margin where it continues toward the paracentral lobule. Inferiorly, the postcentral gyrus narrows toward the lateral sulcus (Sylvian fissure) and the adjacent supramarginal region, while its cortical surface maintains close continuity with neighboring parietal gyri along the convexity. Landmarks are unambiguous. S1 maps contralateral somatic sensation in a somatotopic pattern, so precise identification of the postcentral gyrus matters when correlating focal sensory loss, paresthesia, or cortical sensory seizures with a lesion location. Infarction in the middle cerebral artery territory often affects the lateral postcentral gyrus, producing prominent face and upper limb sensory deficits, whereas more medial involvement shifts symptoms toward the lower limb. Neurosurgical planning benefits from the clear separation of central and postcentral sulci in this viewpoint, which supports teaching how to distinguish primary motor cortex (precentral gyrus) from primary sensory cortex when interpreting functional mapping, awake craniotomy findings, or preoperative navigation. Neuroanatomy and neuroscience courses can pair this illustration with the sensory homunculus to reinforce regional localization on the lateral cerebral surface. It also fits stroke education materials, neuroradiology teaching files (for sulcal-gyral orientation before cross-sectional correlation), and operative atlases discussing lesionectomy near perirolandic cortex. Anatomical accuracy verified by SciePro's Medical Advisory Board.