. Cunningham's Text-book of anatomy. Anatomy. 662 THE NEEVOUS SYSTEM. submerged cortical ridge, the gyrus cunei; and the parieto-occipital will be found to be something more than a mere sulcus. It is, in fact, a great fossa in which are submerged the anterior parts of the area parastriata and area peristriata, and the posterior part of the parietal area known as the precuneus, as well as the sulci which separate these territories one from the other. It is a great trough formed by the splenium of the corpus callosum as in the course of its development it thrusts itself backwards and crumples up
. Cunningham's Text-book of anatomy. Anatomy. 662 THE NEEVOUS SYSTEM. submerged cortical ridge, the gyrus cunei; and the parieto-occipital will be found to be something more than a mere sulcus. It is, in fact, a great fossa in which are submerged the anterior parts of the area parastriata and area peristriata, and the posterior part of the parietal area known as the precuneus, as well as the sulci which separate these territories one from the other. It is a great trough formed by the splenium of the corpus callosum as in the course of its development it thrusts itself backwards and crumples up the cortex. When the corpus callosum fails to develop, no parieto-occipital fossa makes its appearance. The part of the sulcus that notches the supero-medial border (Figs. 589 and 593) forms a distinct element, which Eetzius has called the incisura parieto-occipitalis. Sulcus Oollateralis.—The collateral sulcus is a strongly marked furrow on the tentorial face of the cerebral hemisphere. It begins near the occipital pole and extends forwards towards the posterior end of the rhinal fissure, with which it sometimes becomes confluent. In its posterior part it is placed below, and parallel to, the calcarine fissure, from which it is separated by the lingual gyrus. Erom the posterior extremity a sulcus proceeds forwards and then laterally across the inferior surface of the occipital region, forming a V-shaped pattern with the collateral sulcus (Eig. 585). As it is serially homologous with the latter, being like it an inferior boundary of the area peristriata, it may be called the sulcus collateralis transversus. The lingual gyrus is sometimes subdivided by a furrow (sulcus sagittalis gyri lingualis) midway between the collateral sulcus and the inferior margin of the area striata. It is the line of demarcation between the parastriate and peristriate areas, and when deep is often mistaken for the collateral THE PAEIETAL EEGION. We have seen that the acoustic pathway leads
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