Beginning anteriorly at Sulcus centralis and ending posteriorly and medially at Fissura parietooccipitalis, the region extends at Fissura longitudinalis as far as Corpus callosum, and at the outer surface as far as the Sylvian fissure (from Pars opercularis gyri front. III to the curved-up end of Fissura lat. [Sylvii]). Anteriorly the border is clearly defined, but posteriorly the borders are not sufficiently definable for practical purposes, owing to variations in the length of the Sylvian fissure and its difficult identification in this area, as well as the medially concealed site of Fissura parietooccipitalis. Orientation is easier from the surface of the skull (see Fig. 134): the precentral region begins 10 to 30 mm behind Bregma, and Fissura parietooccipitalis ends in the vicinity of Lambda. The parietal bone thus covers posteriorly the parietal lobe and anteriorly also part of the frontal lobe. The squamous part of the temporal bone also covers the portion of the parietal lobe lying over Fissura lat. (Sylvii). At the outer surface of the brain the limits of the precentral region can only be defined if the neighbouring frontal gyri take a mainly sagittal course and are demarcated from the obliquely lying precentral and postcentral regions. Behind this the relief is so irregular, and its form so masked by the leptomeninges and vessels, that it is usually better to take orientation from the course of the vessels (comparison with the angiogram, especially the superficial cerebral veins).
KeywordsCorpus Callosum Parietal Lobe Arteriovenous Malformation Parietal Region Precentral Region
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