Organic and functional nervous diseases; a text-book of neurology . e combination of symptoms. Lesions of the pons Varolii and medulla oblongata. Fig. 77 showsthe situation in the pons and medulla of the nuclei of origin of thecranial nerves. These nuclei lie either upon the floor of the fourthventricle, shown in Fig. 52 or at a deeper level in the formatio reticu-laris. From the nuclei the nerve fibres pass through the pons andmedulla to make their exit upon the base of the brain, as shownin Fig. 78. It is evident, therefore, that any lesion in the pons or LOCAL SYMPTOMS. 149 medulla will des
Organic and functional nervous diseases; a text-book of neurology . e combination of symptoms. Lesions of the pons Varolii and medulla oblongata. Fig. 77 showsthe situation in the pons and medulla of the nuclei of origin of thecranial nerves. These nuclei lie either upon the floor of the fourthventricle, shown in Fig. 52 or at a deeper level in the formatio reticu-laris. From the nuclei the nerve fibres pass through the pons andmedulla to make their exit upon the base of the brain, as shownin Fig. 78. It is evident, therefore, that any lesion in the pons or LOCAL SYMPTOMS. 149 medulla will destroy either the cranial nerve nuclei or the nervesissuing frq^n them and traversing the cerebral axis at the level of thelesion. The exact level of the lesion will be iudicated by the nervesaffected, oculomotor palsy being caused by lesions in the crus cerebri;fifth, sixth, seventh, and eighth nerve paralysis being caused bylesions in the pons, and ninth, tenth, eleventh and twelfth nerveparalysis being caused by lesions of the medulla. The various symp- FiG. Floe -^, ssf rlV^- Pyc^^^id^ Spop The base of the brain, the cranial nerves, and the cerebellum. II, optic nerves; XII, optic chiasm ;If, infundlbuluin ; El, lateral part of tuber cinereura ; Es, tuber cinereum ; Tm, mammillary bodies;P, crus cerebri; Po, pons; Py, pyramid of medulla; Oi, olivary body; Sma, transverse fissure ofcerebellum ; Floe, flocculus ; ssf, subfloc. fissure ; rlV4, diverticulum of fourth ventricle ; Pyc, pyramidof Malacarne; Amg, amygdalus; Ldg, digastric lobe; Lgr, slender lobe; Lsli, semilunar lobe; II toXII, cranial nerves. (Dejerine.) toms due to lesions of the cranial nerves are discussed in ChapterXXXV., where also the means of distinguishing lesions of the nucleifrom those of the nerve trunks are mentioned. The facts already stated regarding the various tracts passing throughthe pons and medulla, as shown in Figs. 52 to 56, pages 112 and 116, 150 DIAGNOSIS AND LOCALIZATION OF BBAIN DISEAS
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