The Postcentral Gyrus Of The Brain In A Lateral View

Description

Running vertically on the lateral cerebral hemisphere, the postcentral gyrus forms the cortical strip immediately posterior to the central sulcus and anterior to the postcentral sulcus. As the animation holds a lateral view, the gyrus is seen superior to the lateral (Sylvian) fissure, continuing toward the superomedial margin where it blends with the paracentral lobule on the medial surface. Subtle rotation and depth cues clarify the sulcal boundaries, separating the postcentral gyrus from the precentral gyrus anteriorly and the superior and inferior parietal lobules posteriorly. Functional anatomy rides on this fold. The postcentral gyrus contains primary somatosensory cortex (Brodmann areas 3, 1, and 2), where tactile, proprioceptive, and nociceptive inputs from the contralateral body map in a somatotopic sequence from the inferolateral face region to the superomedial lower limb representation. That moving relationship between gyri and sulci matters when correlating focal lesions to deficits, for example parietal infarcts in the middle cerebral artery territory causing contralateral sensory loss in face and upper limb, or perirolandic mass effect producing mixed motor and sensory symptoms that hinge on whether the central sulcus is crossed. Sequential emphasis on the central versus postcentral sulcus helps prevent a common teaching error, mislabeling the precentral gyrus (primary motor cortex) as sensory cortex on a single still frame. Use this animation in neuroanatomy and neuroscience teaching blocks, in radiology orientation modules that pair surface landmarks with axial MRI, and in neurosurgical planning discussions focused on perirolandic tumors, cortical mapping, or seizure foci near the sensorimotor strip. Anatomical accuracy verified by SciePro's Medical Advisory Board.