. Cunningham's Text-book of anatomy. Anatomy. THE WHITE MATTEE OF THE CEEEBEAL HEMISPHEEES. 651 The fasciculus occipito-frontalis superior is a bundle of fibres which runs in a sagittal direction in intimate relation to the lateral ventricle (Fig. 576, p. 649). It may- be regarded as the medial edge of the superior longitudinal bundle. It has been pointed out (Forel, Onufrowicz, and others) that, in cases where the corpus callosum fails to develop, the tapetum remains apparently unaffected, and Dejerine has endeavoured to prove that the fibres of this layer really belong to the fasciculus occi
. Cunningham's Text-book of anatomy. Anatomy. THE WHITE MATTEE OF THE CEEEBEAL HEMISPHEEES. 651 The fasciculus occipito-frontalis superior is a bundle of fibres which runs in a sagittal direction in intimate relation to the lateral ventricle (Fig. 576, p. 649). It may- be regarded as the medial edge of the superior longitudinal bundle. It has been pointed out (Forel, Onufrowicz, and others) that, in cases where the corpus callosum fails to develop, the tapetum remains apparently unaffected, and Dejerine has endeavoured to prove that the fibres of this layer really belong to the fasciculus occipito-frontalis. The fasciculus occipito-frontalis lies on the medial aspect of the corona radiata in intimate relation to the caudate nucleus, and posteriorly it spreads out over the superior and lateral aspect of the lateral ventricle, immediately outside the ependyma, where, according to Dejerine, it constitutes the tapetum (see p. 632). Projection Fibres.—We have already seen that every part of the cerebral cortex is linked to other cortical areas, not only in its own neighbourhood (short association fibres) (Fig. 578), but also in the most distant parts of the hemi- sphere (long association fibres), as well as to the cortex of the other hemi- sphere (commissural fibres). In addition there are two large series of fibres: (i.) an ascending group which conveys to the cerebral cortex im- pulses coming from the thalamus and metathalamus, the corpora quadri- gemina and the red nucleus, and the various other sensory nuclei scattered throughout the brain stem and spinal medulla; and (ii.) a descending group connecting the cerebral hemisphere with the corpus striatum, various parts of the diencephalon, mesencephalon and cerebellum, as well as with all the motor nuclei scattered throughout the central nervous system. These two groups of tracts, respectively passing to and from the cerebral cortex, are known collectively as its projection fibres. While examining the general ar- rang
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