Which fissure separates the left and right cerebral hemispheres?

Which fissure separates the left and right cerebral hemispheres?

• A. Longitudinal fissure
• B. Transverse fissure
• C. Sylvian fissure
• D. Central sulcus

Answer: (A)

The longitudinal fissure is the groove that divides the left and right cerebral hemispheres. It runs along the midline in the sagittal plane, creating the deep separation between the two halves and containing the falx cerebri, a fold of dura mater. The other options mark different boundaries: the transverse fissure lies horizontally and separates the cerebrum from the cerebellum, not the hemispheres; the Sylvian (lateral) fissure separates the frontal/parietal lobes from the temporal lobe on the lateral surface; and the central sulcus separates the frontal and parietal lobes. So the midline, left-right division is defined by the longitudinal fissure.

The longitudinal fissure is the groove that divides the left and right cerebral hemispheres. It runs along the midline in the sagittal plane, creating the deep separation between the two halves and containing the falx cerebri, a fold of dura mater. The other options mark different boundaries: the transverse fissure lies horizontally and separates the cerebrum from the cerebellum, not the hemispheres; the Sylvian (lateral) fissure separates the frontal/parietal lobes from the temporal lobe on the lateral surface; and the central sulcus separates the frontal and parietal lobes. So the midline, left-right division is defined by the longitudinal fissure.