Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . hich they had acquired previous to the development ofthe lesion. A knowledge of this fact may sometimes aitl in tlie locali-zation of a lesion. Irritative lesions of the cortex of the cuneus (a part of the occipital CORTICAL LESIONS OF THE CEREBRUM. 71 lobes) may cause hallucinations of vision. If one hemisphere only isaffected, the objects seen will appear to lie on the side opposed to thelesion, and to move with the eyes as
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . hich they had acquired previous to the development ofthe lesion. A knowledge of this fact may sometimes aitl in tlie locali-zation of a lesion. Irritative lesions of the cortex of the cuneus (a part of the occipital CORTICAL LESIONS OF THE CEREBRUM. 71 lobes) may cause hallucinations of vision. If one hemisphere only isaffected, the objects seen will appear to lie on the side opposed to thelesion, and to move with the eyes as they are turned from side to side. Lesions of the island of Reil,^ or insula^ of the left side (Fig. 9),seem to create (in some instances) symptoms of ataxic aphasia., and alsoparaphasia (the substitution of wrong words). The motility of the faceand arm of the opposed side may occasionally be impaired from corticallesions of this region. Lesions of the cortex confined to the apex of the femjMval lobe () are liable to cause an impairment of the sense of smell or of taste (ifdestructive in character); or subjective odors and tastes (if irritative incharacter).. MEDULLA Fig. 25.—A Diagram Designed to Illustrate the General Course and DistributionOF the Motor and Sensory Tracts of the Cerebrum. (Modifiedslightly from Seguin.)P, Parietal lobes, F, frontal lobes, T, temporal lobes; O, occipital lobes ; M, motor bundles .S, sensory bundles, N C, nucleus caudatus, N L, nucleus lenticularis ; O T, oplic thala-mus , C Q, corpora quadrigemina , 1, sensory (posterior) bundles of the medulla, pons, andcrus , 2, motor (anterior) bundles of the same. Note that the motor fibres are associated withthe frontal and parietal lobes; and the sensory fibres with the parietal, temporal, and oc-cipital lobes Destructive lesions of the cortex of the motor convolutions (Fig. 5)are followed b}- a descending degeneration of the fibres which arise fromthese gyri. This may account (?) for the late rig
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