Polar Plane Of The Human Brain, Anatomy

Description

Cerebral polar plane anatomy centers on the anterior segment of the superior temporal gyrus (gyrus temporalis superior) along its upper surface, at the temporal pole just inferior to the frontal and parietal opercula. The polar plane lies within the anterior portion of the lateral sulcus (fissura lateralis cerebri), so its medial aspect faces the insular cortex while its lateral margin blends into the lateral convexity of the temporal lobe. Posteriorly, this area transitions toward the transverse temporal gyri (gyri temporales transversi, Heschl) and the planum temporale, with the superior temporal sulcus forming an inferolateral boundary. This region matters because it sits at the gateway between the temporal pole and the peri-Sylvian auditory association territory, a common corridor for pathology and surgical access. Lesions here, including low-grade glioma or focal cortical dysplasia, can present with temporal lobe epilepsy, auditory auras, or language-related symptoms when dominant-hemisphere peri-Sylvian networks are involved. A fixed superior-temporal perspective that prioritizes the gyrus’s upper surface helps clarify why the polar plane is easily overlooked on routine lateral views yet becomes conspicuous on axial MRI slices through the anterior Sylvian fissure and on intraoperative exposure via a transsylvian approach. Use this illustration in neuroanatomy teaching on temporal lobe surface landmarks, in neurosurgical atlases discussing transsylvian and anterior temporal approaches, or in neuroradiology materials that correlate the superior temporal gyrus with axial and coronal imaging planes near the temporal pole. It also supports medical publishing on peri-Sylvian language and auditory cortex localization, where precise terminology around the superior temporal gyrus surface reduces ambiguity. Anatomical accuracy verified by SciePro's Medical Advisory Board.