MOTOR CORTEX XXD INTERNAL CAPSULE IN AN ORANG-OUTANG. 143 
integrated ; thus movement of the hip (only) occurred at no less than eight squares, 
viz., Nos. 48, 49, 50, 51, 52, 53, 65, and 66. 
The very large majority of these will be found to be aggregated on the upper 
border of the upper limb region, close to where the shoulder is most represented. See 
“ Marches,” p. 144, and conclusions, p. 151. 
Character of the Movements. —In contradistinction to what we found in the Bonnet 
Monkey {loc. cit.) the character of the movement was extension of the hip (and knee), 
indeed with but three exceptions of which only one was a pure flexion. The explana¬ 
tion of this we offer on p. 151. The movements observed may be thus arranged :— 
Extension observed at squares Nos. 48, 49, 50, 51, 52, 53, 61, 62, 63, 64. 
Adduction. 52, 53. 
Flexion . 68. 
flotation. 65, 66. 
See also next chapter, “ Marches.” 
(A.) Cortex.—Right Hemisphere. 
After the excitation of the left hemisphere had been completed as far as possible 
{i.e., until the fall in blood pressure began to affect the excitability) we proceeded to 
rapidly expose the right hemisphere and to exj^lore it with the same stimulus. 
We found that the so-called motor points were symmetrically situated in the two 
hemispheres, and in consequence that the inexcitable regions {vide infra) which we 
were careful to explore first, as soon as the brain was ex])osed, were also similarly 
situated on the two sides. The only trifling difference we noted was that at squares 
121, 125 on the right side we obtained marked closure (blinking) of the opposite 
eyelids. This means, of course, simply that on this side the representation of this 
movement was rather more highly differentiated. 
We made an observation on the paracentral lobule in vertical line with square 78, 
i.e., 7-8 mm. in front of the upper end of the Fissure of Rolando of this hemisphere, 
and found that the lower limb was alone represented there, i.e., without the abdomen. 
See “ Marches.” 
Marches. 
Since, as a rule, the effect obtained by exciting the cortex of the Orang was a 
single primary movement, a march of the spasm from one group of muscles to another 
was exceptional. We, therefore, have deemed it best to collect together under one 
heading all such “ Marches” as follows ;— 
