A treatise on the principles and practice of medicine . sight, of greater localizing significance if there is no opticneuritis. These bodies are connected with the external geniculate bodies CEREBRAL LOCALIZATION 759 and, by way of the internal capsule, with the optic radiation, (b) Inacute lesions, narrowing of the pupil is suggestive. In old lesions, oneor both pupils are wide and without reaction to light or accommoda-tion, (c) The eye muscles may be partially paralyzed (ptosis and upwardmovements) but are not pathognomonic, because the lesion is so nearthe nucleus of the third nerve. Disea
A treatise on the principles and practice of medicine . sight, of greater localizing significance if there is no opticneuritis. These bodies are connected with the external geniculate bodies CEREBRAL LOCALIZATION 759 and, by way of the internal capsule, with the optic radiation, (b) Inacute lesions, narrowing of the pupil is suggestive. In old lesions, oneor both pupils are wide and without reaction to light or accommoda-tion, (c) The eye muscles may be partially paralyzed (ptosis and upwardmovements) but are not pathognomonic, because the lesion is so nearthe nucleus of the third nerve. Disease of the posterior corpora quaclri-gemina may result in (a) ataxia; some refer it to cerebellar disease, toconnections with the cerebellum through the nucleus ruber or to diseasein the fillet of the tegmentum; (b) trochlearis paralysis, in which theeyes cannot be turned inward or outward; and sometimes abducensparalysis; (c) difficult mastication from involvement of the descendingbranch of the quintus; (d) contralateral disturbance of hearing, since. Fig. 53.—Lesion in crus (shown by dotted lines), producing a superior alternating orcrossed hemiplegia; the lesion involves the pyramidal tract (), the cranial nerves (tongueand face, ) and the oculomotor nerve (IIIf) which is paralyzed on the same side as thelesion, while and are paralyzed on the opposite side. , aqueduct of Sylvius;III, nucleus of third nerve; , corp. geniculatum int.; F\, upper part and F2, lowerpart of fillet; , nucleus ruber; , substantia nigra. the post. corp. quadrigemina are connected with the fillet of the tegmen-tum and, by means of the sensory crossway of the internal capsule,with the hearing centre. XI. The Crus (Cerebral Peduncle).—The motor fibers to the cranialnerves decussate higher than the pyramidal tracts which decussate inthe medulla; the fibers to the third nerve largely cross in the uppercrus. Crossed paralysis (hemiplegia alternans oculomotoria superio
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