postcentral sulcus postcentral sulcus the postcentral sulcus of the parietal lobe lies parallel to, and behind, the central sulcus in the human brain. (a sulcus is one of the prominent grooves on the surface of the brain.) postcentral sulcuspostcentral sulcus of the human brain.lateral surface of left cerebral hemisphere, viewed from the side.detailsidentifierslatinsulcus postcentralisneuronames99neurolex idbirnlex_4033ta98a14.1.09.129ta25470fma83774anatomical terms of neuroanatomy the postcentral sulcus divides the postcentral gyrus from the remainder of the parietal lobe. additional images lateral surface of left cerebral hemisphere, viewed from above. gyri and sulci of right cerebral hemisphere. postcentral sulcus labeled in red at top center.