. Quarterly journal of experimental physiology and cognate medical sciences. t hemisphere reversed, re-sponses from opened-up parts of sulci and from free surface. The animal was of the varietyTroglodytes calvus, and very intelligent. a basis, the rest of the deep contour is given by interpolating determina-tions obtained in other chimpanzee hemispheres. In our observations theposterior boundary of the motor cortex lying hidden in sulcus centralisseems to be more abruptly and sharply delimited than is the anteriormargin of it, lying largely on the free surface of the hemisphere. The motor resp
. Quarterly journal of experimental physiology and cognate medical sciences. t hemisphere reversed, re-sponses from opened-up parts of sulci and from free surface. The animal was of the varietyTroglodytes calvus, and very intelligent. a basis, the rest of the deep contour is given by interpolating determina-tions obtained in other chimpanzee hemispheres. In our observations theposterior boundary of the motor cortex lying hidden in sulcus centralisseems to be more abruptly and sharply delimited than is the anteriormargin of it, lying largely on the free surface of the hemisphere. The motor responses yielded from points buried in sulcus centraliscorresponded for the most part rather closely with the motor responsesyielded by the free surface of centralis anterior of about the samehorizontal level. A good deal of the local area for pinna seems to lieburied in the sulcus close below inferior genu, and we have obtained pinnamovements from the anterior wall of the sulcus at that place in specimenswhere we could not elicit them from the free surface of the gyrus. The. Fig. -A and B, Orang 1, left hemisphere ; three perspective plans,refer to the List of Responses, pp. 148-154, The numerals and letters 158 Ley ton and Sheii-in^ton precentral sulci, superior and inferior, also contain portions of the motorcortex. These sulci are far more variable in their extent and position inthe anthropoid than is sulcus centralis, so that it is not easy to make aireneral statement as to the amount of motor cortex thev contain that canapply strictl}^ to all cases. In the hg. 15, from a chimpanzee, is representedthe amount buried in them in that specimen as experimentally ^er, the determination of the exact position of the anterior limit ofthe motor cortex is even on the free surface a matter of some artificiality,because in the anterior direction the motor field as examined by faradisa-tion seems to fade oft graduatim, so that a prolonged series of stimulationsin that neig
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