File:Quarterly journal of experimental physiology and cognate medical sciences (1908) (14764593384).jpg

Identifier: quarterlyjournal11edinuoft (find matches)
Title: Quarterly journal of experimental physiology and cognate medical sciences
Year: 1908 (1900s)
Authors:
Subjects: Physiology
Publisher: Edinburgh (etc.) E. & S. Livingstone (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ity was detected, but such ex-amination was difficult, as the animal was not tame. A week later, no paresis having in the meantime been manifest, theanimal was again chloroformed, and the whole of tlie precentral gyrus, The Excitable Cortex of the Chimpanzee, Orang-Utan, and Gorilla 211 systematically examined by the electrodes, revealed nothing abnormal inits resj)onses, either in the direction of excessive or of defective response.The animal was then destroyed by chloroform. In another experiment (tig. 2S) the lower part of the gyrus was exjjosed,and after point-to-point examination of it with the electrodes had beenfound to yield no motor or other detected responses the gyrus was ablatedwith the knife from close above inferior cjenu downward for one-half of itslength below that genu. The anterior boundary of the ablation was madeby thrusting the knife between the lips of that part of sulcus centralis andsloping it downward and backward through the posterior wall of the fissure .Cf-
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Fio. 28.—Lesion in gyrus centralis posterior giving no symptoms and no degeneration in bulbor spinal cord ; chimpanzee, ablation-experiment 10. thus avoiding the floor of the sulcus and the deepest portion of the posteriorwall. The width of the ablated portion in its upper part extended back tothe lower spur of the post-central sulcus, and below that parallel with sulcuscentralis and 15 mm. behind it. The lowest boundary ran horizontally fromsulcus centralis to the posterior cut behind. On recovering from the anaesthetic the animal showed no trace ofparesis either in hand or face, no impairment in mastication or drinkingor swallowing, in short, no detected departure from normal motility. Theskin of the right half of the face could feel, but it was not possible toassure oneself that its sensation was undisturbed and actually normal.Fifteen days later the animal was used for systematic examination of themotor cortex, and the precentral gyrus throughout its facial as well as its 212 Le

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