What anatomical structure is divided by the collateral sulcus?

The parahippocampal gyrus and the fusiform gyrus are indeed separated by the collateral sulcus, which plays an essential role in dividing specific regions of the temporal and occipital lobes on the underside of the cerebral hemispheres.

The parahippocampal gyrus is involved primarily in memory encoding and retrieval, as it is closely associated with the hippocampus, while the fusiform gyrus is important for visual processing, particularly in recognizing faces and complex visual stimuli. The collateral sulcus facilitates the distinction between these two gyri, influencing how these regions communicate and function in processing information.

Understanding this anatomical division helps in recognizing how different regions of the brain are organized and their respective roles in cognition and perception.