Human anatomy, including structure and development and practical considerations . een absent, the optic fibres passing directly intothe tract of the same side. 1224 HUMAN ANATOMY. The entire commissure, liowevL-r, is not composed t>{ optic fibres, since its posterior partis formed by a bundle, known as Guddens commissure (commissura inferior) (page mo;, wliichpasses forward along the mesial side of the optic tract, loops around the posterior angle of thecommissure and enters the opposite tract. These fibres have no connection with the path ofsight-impulses, but are probably chielly related
Human anatomy, including structure and development and practical considerations . een absent, the optic fibres passing directly intothe tract of the same side. 1224 HUMAN ANATOMY. The entire commissure, liowevL-r, is not composed t>{ optic fibres, since its posterior partis formed by a bundle, known as Guddens commissure (commissura inferior) (page mo;, wliichpasses forward along the mesial side of the optic tract, loops around the posterior angle of thecommissure and enters the opposite tract. These fibres have no connection with the path ofsight-impulses, but are probably chielly related with the median (jr internal geniculate bodiesand the inferior corpora (|uadrigemina (page iiioj. The optic commissure also contains fibre-strands that arch around its posterior angle, par-allel with, but separated by a thin layer of gray matter from Guddens tract. Concerning theorigin and destination of these fibres, termed Meynerts commissure (commissura superior), littleis known. By some they are regarded as continuations of the mesial fillet that, after decussa- FlG. Diagram showine course of retinal fibres fn optic pathway and their comiection with basal ganglia and primarycortical centres; smaller figure illustrates path of light-ray and resulting impulse through retina : A, retina : OJV, OC,OT, OR, optic nerve, chiasm, tract and radiation , P, pulvinar ; Eg, SQ, lateral geniculate and superior quadrigem-inal bodies; Oc Cx, occipital cortex ; ///, IV, VI, nuclei of eye-muscle nerves. tion, pass to the globus pallidus of the lenticular nucleus of the opposite side. Others denysuch relations, while Kolliker describes them as bending upward, traversing the ventral partof the cerebral peduncle, to end within the corpus subthalamicum (page 1128). Additional commissural fibres (commissura ansaia) descend from the floor of the thirdventricle and from the peduncle of the septum lucidum, by way of the lamina terminalis, to thefront and upper part of the optic chiasm ; other
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