What are the folds separating the lobes of the brain called?

The folds that separate the lobes of the brain are known as fissures. Fissures are deep grooves that divide the brain into distinct areas, and they play a critical role in organizing various brain functions. Each major lobe of the brain is separated by these significant fissures, which helps facilitate complex processes and maintains the brain's structural integrity.

While gyri refer to the raised ridges or convolutions on the surface of the brain, and sulci are the shallower grooves between the gyri, it is the fissures that are specifically responsible for delineating the different lobes, thereby providing a clearer understanding of the brain's anatomy. Neurons, on the other hand, are the fundamental units of the nervous system that transmit information but do not pertain specifically to the structural division of the brain's lobes.