What is a gyrus in relation to brain anatomy?

A gyrus is a specific feature of brain anatomy, characterized as a folded ridge between anatomical grooves. In the context of the brain's surface, gyri are the raised areas that separate the deeper grooves known as sulci. This folding increases the surface area of the brain, allowing for a greater number of neurons and connections, which plays a crucial role in many cognitive functions. Understanding the structure of gyri and sulci helps clarify how the brain is organized and how different areas can be correlated with various functions, but the key point is that a gyrus specifically refers to those raised, folded areas of the cerebral cortex.