. Contributions from the Department of Neurology and the Laboratory of Neuropathology (reprints). Fig. 2.—Jiimve the tentorium. Tlte only important signs were largebead, nystagmus, papiiledeaia. and diminished patellar reflexes. usually late in ajjpearing m the symptom-complex. Ihave known loss of smell to occur from a tumor at theforamen magnum, arid paralysis of an external rectusmuscle from a tumor of the parietal lobe. The abducens 6 nerve has the longest intracrauial course of any of thecranial nerves, arising, as it does, at the union of thepons and medulla oblongata and leaving the skul
. Contributions from the Department of Neurology and the Laboratory of Neuropathology (reprints). Fig. 2.—Jiimve the tentorium. Tlte only important signs were largebead, nystagmus, papiiledeaia. and diminished patellar reflexes. usually late in ajjpearing m the symptom-complex. Ihave known loss of smell to occur from a tumor at theforamen magnum, arid paralysis of an external rectusmuscle from a tumor of the parietal lobe. The abducens 6 nerve has the longest intracrauial course of any of thecranial nerves, arising, as it does, at the union of thepons and medulla oblongata and leaving the skullthrough the sphenoidal fissure; and one should be cau-tious in accepting its paralysis as a localizing sign, unlesswhen it occurs early. Every experienced neurologist has met apparent con-tradictions between focal lesions and symptoms. Certainareas of the brain have been general] v recognized as hav-. .\ lai^ \?i^^\\ ul llie sauii luuiui sliuwu in Iigure ing to do with certain functions, and yet these areas havebeen destroyed without a corresponding loss of explanations have been sought. The statementhas been made that a portion of the area must have beenleft intact, or the corresponding area in the oppositehemisphere must have assumed a viearions explanations have not satisfied all investigators; von Moiiakow has put forward bis diaschisis theory,and insists tliat we must not identify localization offunction with localization of symptoms. Localizationof focal symptoms is a complicated reaction of the unin-jured nervous system to the local cortical insult;whereas the localization of function depends on theaction of all the elements of the function concerned inthe entire central nervous system. When an area of thebrain is destroyed, many tracts in connection with thisarea, commissural, associative,, projectile, are injured oi-destroyed, and the
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