What is a sulcus in the context of brain anatomy?

A sulcus, in the context of brain anatomy, refers to a shallow furrow or groove that separates adjacent gyri, which are the raised folds on the surface of the brain. These sulci are significant because they help to increase the surface area of the brain, allowing for a greater number of neurons and thus more complex brain functions. The arrangement of sulci and gyri creates distinct anatomical landmarks within the brain, aiding in the identification of specific regions and their associated functions. Understanding the organization of sulci and gyri is crucial for studying brain anatomy and function, as it provides insight into the structural complexities of the cerebral cortex.