What is the groove or split between the two cerebral hemispheres called?

• A. Sylvian Fissure
• B. Central Sulcus
• C. Longitudinal Cerebral Fissure
• D. Parieto-Occipital Fissure

Answer: (C)

The groove that separates the two cerebral hemispheres down the midline is the longitudinal fissure, also known as the interhemispheric fissure. It runs along the sagittal plane and houses the falx cerebri, a fold of dura mater that helps partition the two hemispheres. This midline separation is what defines the left and right cerebral hemispheres.

The other grooves lie elsewhere: the Sylvian fissure (lateral sulcus) sits on the lateral surface between the frontal/temporal and parietal lobes; the central sulcus marks the boundary between the frontal and parietal lobes on the lateral surface; the parieto-occipital fissure is a groove on the medial surface separating the parietal and occipital lobes.