Topography of the Cerebral Hemispheres . Surface structures. The surface of the brain has complicated folding which substantially increases the surface area of the brain. Gyrus (Gyri, pl) Folds or convulsions Sulcus (Sulci, pl) Intervening grooves
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1. Lateral sulcus separates frontal and temporal lobes starts from inferior surface of the hemisphere, stem (beginning segment) of the sulcus extends laterally and divides into three rami on reaching the lateral surface, anterior, ascending, and posterior ramus
2. Central sulcus separates frontal and parietal lobes. Primary motor area is in front of it and somatosensory area is right behind.
1. Longitudinal cerebral fissure separates two hemispheres falx cerebri extends into the fissure
2. Transverse cerebral fissure separates cerebral hemisphere with cerebellum. tentorium cerebeli extends into the fissure. The anterior part of the fissure separates cerebral hemisphere with midbrain and diencephalon