The wrinkles in the brain are called sulci and gyri.
Sulci in the brain are grooves or depressions between the gyri.
Gyri is the raised ridges or folds in the brain.
The gyri and sulci wrinkles in the brain increase the surface area of the brain and allow for more neurons as well as connections.
The increased surface area of the brain which are as a result of the gyri and sulci wrinkles in the brain which allows more neurons and connections are essential for complex cognitive functions.
Without these wrinkles in the brain a person would be severe impaired or not be able to thrive.
The wrinkled surface of the brain is the cerebral cortex which is the outer layer which is responsible for higher cognitive functions such as consciousness, language and memory.
The process of folding and unfolding during brain development to create gyri and sulci and increasing surface area is called Gyrification.
The Gyri and Sulci ridges are formed as the cortex of the brain expands during the brain development.
The folds in the brain or wrinkles increase the surface area of the brains cortex and allows for more brain tissue to fit within the skull and enables more complex cognitive functions.
Gyrification begins during fetal development and continues after birth, with larger brains being more highly folded.
Most often brains that are larger have more prominent folds and gyri and smaller brains have a smoother surface.