Human anatomy, including structure and development and practical considerations . om the occipital and temporal lobes are defined for the most partby imaijinary lines. Its upper boundary corresponds with the supen^-niesial borderof the hemisphere ; its anterior boundary is the central fissure, by which the pari-etal lobe is completely separated from the frontal excejjt below, where the postcen-tral jJ^yrus is continuous with the precentral by the bridge closin^^ the lower end ofthe Rolandic fissure. Its posterior boundary, which sejKirates the parietal fnjm theoccipital lobe, is largely conven
Human anatomy, including structure and development and practical considerations . om the occipital and temporal lobes are defined for the most partby imaijinary lines. Its upper boundary corresponds with the supen^-niesial borderof the hemisphere ; its anterior boundary is the central fissure, by which the pari-etal lobe is completely separated from the frontal excejjt below, where the postcen-tral jJ^yrus is continuous with the precentral by the bridge closin^^ the lower end ofthe Rolandic fissure. Its posterior boundary, which sejKirates the parietal fnjm theoccipital lobe, is largely conventional and indicated by a line drawn from the pointwhere the parieto-occipital fissure cuts the upper margin of the hemisphere to an in-dentation, the preoccipital notch (page 1134), which grooves the infero-lateral borderof the hemisphere at a point from cm. in front of the occipital pole. Itsinferior border, between the parietal and the temporal lobes, is definite where formedby the posterior limb of the Sylvian fissure. Beyond the upturned end of the latter, Fig. Infero-mesial aspect of left cerebral hemisphere; cm., calloso-marginal fissure; ros., rostral; overturnedend of Rolandic ; p. /., post-limbic ; i. p-o., internal parietooccipital; p. cal., a. ca/., posterior and anterior calcarine ;fi. col., a. col., posterior and anterior collateral ; i. L, incisura temporalis or rhinial; o-t., occipito-temporal. the parietal and the temporal lobes are continuous and their separation is conven-tionally assumed to be made by an arbitrary line prolonged backward in the direc-tion of the posterior limb of the Sylvian fissure until it meets the parieto-occipitalline previously described. The externa/ surface of the parietal lobe is subdi\ided by a composite fissure,the interparietal sulcus, into three general tracts, the postcentral, the superior pari-etal and the inferior parietal gyrus. The interparietal sulcus, especially described by Turner, starts in the antero-in
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