Four lobes are traditionally identified in each cerebral hemisphere of the human brain: frontal, parietal, temporal, and occipital.
These lobes are named mainly for the overlying skull bones and provide a broad anatomical map of the cerebrum. The frontal lobe is associated with executive functions and voluntary movement, the parietal lobe with sensory integration, the temporal lobe with hearing and memory, and the occipital lobe with vision.
The boundaries are not simply four separate compartments. Functional networks commonly cross lobe borders, and many abilities depend on communication among distant regions. The insular cortex is sometimes described as a fifth lobe because it lies deep within the lateral sulcus, but it is not included in the traditional four-lobe count.
The cerebral hemispheres are divided by the longitudinal fissure, while major grooves help mark boundaries between the named lobes. This makes “four” the standard answer for the conventional surface-anatomy classification.