Question: what is the difference between a gyrus and sulcus and a lobe of the brain?
Answer: Sulci, the grooves, and gyri, the folds or ridges, make up the folded surface of the cerebral cortex. ... A sulcus is a shallower groove that surrounds a gyrus. A fissure is a large furrow that divides the brain into lobes and also into the two hemispheres as the longitudinal fissure.