Gyri and sulci are the surface of the human brain.

1. cortex, forebrain
2. fissures; folds
3. folds; grooves
4. grootss, folds

Gyri are the raised areas or “folds” of the brain’s surface, while sulci are the grooves that separate these folds. This folding increases the surface area of the brain, allowing for a greater number of neurons and enhanced cognitive function. It’s like a wrinkled brain, maximizing its potential!

This structure is particularly important in humans, as our complex behaviors and cognitive abilities are closely linked to the development and arrangement of gyri and sulci in the cortex. Think of gyri and sulci as the brain’s way of packing in more neural real estate—like cramming your clothes into a suitcase!