Brain Gyrus and Sulcus Gyri and sulci are the folds and indentations of the brain that give it its wrinkled appearance. Gyri (singular: brain gyrus) are the folds or bumps in the brain and the sulci (singular: sulcus) are the indentations or grooves or pleated. The folding of the cerebral cortex creates gyri and grooves … Continue reading Brain Gyrus (Cerebral cortex) and Sulcus (Neuroanatomy) | Important features of the central nervous system