Human anatomy, including structure and development and practical considerations . per surface of this structure, lodged within the callosal gyrus, and, curvingaround the splenium, descends withinthe hippocampal gyrus to end in thefore-part of the temporal lobe and per-haps also in the uncus. The cingulumis not composed of fibres which extendits entire length, but is made up of anumber of shorter tracts, as shown byits incomplete degeneration after sectionof the fasciculus. The superior longitudinal fas-ciculus, also called the fasciculusarcuatus, passes from the frontal andparietal opercula. o
Human anatomy, including structure and development and practical considerations . per surface of this structure, lodged within the callosal gyrus, and, curvingaround the splenium, descends withinthe hippocampal gyrus to end in thefore-part of the temporal lobe and per-haps also in the uncus. The cingulumis not composed of fibres which extendits entire length, but is made up of anumber of shorter tracts, as shown byits incomplete degeneration after sectionof the fasciculus. The superior longitudinal fas-ciculus, also called the fasciculusarcuatus, passes from the frontal andparietal opercula. over the region ofthe insula, to the inferior parietal con-volution, the occipital lobe and the superior and middle temporal convolutions. Itis composed of a number of short bundles which proceed from the frontal lobe partlyin the sagittal direction towards the occipital lobe, and partly in cur\es into thetemporal lobe. The inferior longitudinal fasciculus is a well-marked bundle which extendsfrom the tip of the occipital lobe and the cuneus, along the outer side of the optic. Diagram showing association fibres, mesial surface; fibresare supposed to show through transparent hemisphere. 1184 HUMAN ANATOMY. Fig. 1023. radiation and tlie posterior and inferior horns of the lateral ventricle to the fore-partof the temporal lobe. It is probably an ini|)ortant j)ath by which visual impressionsarc transmitted to olhti- of the C(jrtex ( Dcjerinej. Anion,:.; thu adiiitioiial association trails which have been described may be mentioned : The fasciculus occipitalis perpcndicularis, which extends from the upper part of theoccipital lt)be and the upper part of the inferior parietal convolution to the occipito-tempora!convolution. The fasciculus fronto-occipitalis, which courses sajjittally and lies in intimate relation withthe lateral veiUricle and the ( aiidate nucleus, and to the mesial side of the corona radiata. The fasciculus temporo-parietalis, wliich unites the temporal convol
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