. A treatise on nervous and mental diseases, for students and practitioners of medicine. elateral geniculate body, then to the pulvinar, and then to theoptic tracts, which, crossing in the optic chiasm, pass to the 28 is a diagram of this course of the optic nerve. It showsits cortical origin in the cuneus, thence its passage iuto the internal ANATOMY. 45 capsule, through the optic thalamus into the anterior quadrigeminalbody, and thence to the geniculate body, to the otitic tract, to thechiasm, to the retina. It will be observed that the optic fibres proceedfrom the left cuneus to
. A treatise on nervous and mental diseases, for students and practitioners of medicine. elateral geniculate body, then to the pulvinar, and then to theoptic tracts, which, crossing in the optic chiasm, pass to the 28 is a diagram of this course of the optic nerve. It showsits cortical origin in the cuneus, thence its passage iuto the internal ANATOMY. 45 capsule, through the optic thalamus into the anterior quadrigeminalbody, and thence to the geniculate body, to the otitic tract, to thechiasm, to the retina. It will be observed that the optic fibres proceedfrom the left cuneus to the left half of each retina, which would bethe outer half of the left eye and the inner half of the right eye. Asthe rays of light, however, cross in the optic lens when they comefrom without to reach the retina, this blindness of the outer half ofthe left retina would incapacitate the patient from seeing objects tothe inner side of the median line, whilst the blindness of the left or Fig. 28. OPTIC NEnvE OPTIC CHIA5M LATERAL OSNICULATL BODV OfTIC TRACT POSTIRIOHiUMPISCMINALj^ -BOD. NTERIOROUADRIO£MINALBODY Diagram of the course of the optic fibres from the cuneus to the retina. inner half of the right eye would incapacitate the patient from seeingobjects to the outer side of the median line of the right eye. Thisshould be clearly understood, for, as has already been stated, theblindness of the retina is called hemiopia, whilst the inability to seeobjects with this retina is called hemianopsia, so that the left hemi-opia of the case which we have been supposing would cause a righthemianopsia. Fig. 29 gives us another view of these central and basal ganglia whichwe have been describing. It represents a section midway through thecorjjus callosum (c c), which we have seen in Fig. 18 forming the floorof the great longitudinal fissure and connecting the two the cor])us callosum is seen the third ventricle (3) runningdown into a funnel-shaped prolongation, know
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