FIBRES OF THE INTERNAL CAPSULE OF THE BONNET MONKEY. 
51 
of the cortex produced descending degeneration, which cannot be traced beyond tlie 
lower limits of the bulb— i.e., beyond the anterior pyramid of the same side. 
Nothnagel* never observed motor paralysis to follow either unilateral or bilateral 
division of the internal capsule in the Rabbit. 
MoNAKOwt removed in the Rabbit the anterior portion of the liemdsphere, including 
part of the excitable zone, and found that this was followed by atrophy of the 
anterior part of the internal capsule. Removal of the middle zone of the cortex 
produced atrophy of the third fifth of the capsule, while destruction of the hinder 
third of the hemisphere {i.e., occipital portion) caused atrophy of the hinder third of 
the capsule. He further found| that removal of Fereier’s centres 6 and 9 produced 
respectively atrophy of the hinder and dorsal part, and of the posterior part of the 
capsule. Finally, the corpus striatum was always normal. 
Gudden§ figures (fig. 4, Taf. VIII.) a section of the hemisphere of a Rabbit, the 
upper third of which, including a thin slice of the corpus striatum, had been removed. 
The specimen shows marked atrophy of the internal capsule. Tlie same author|| also 
removed in young Rabbits the frontal lobe (“ stirnhirn ”) and found that while the 
corpus striatum remained normal, the “ medial part of the peduncle ” and the 
corresponding pyramid and spinal cord were atrophied. 
Carnivoo'a. 
Several authors have made experiments on the Cat and Dog. 
J. Burdon-S ANDERSON If excitecl electrically in the Cat the fibres of the corona 
radiata, and subsequently the corpus striatum, producing the same movements as he 
had previously obtained by excitation of the cortex. 
Caryille and Duret.** These authors divided the anterior two-thirds of the 
internal capsule in the Dog, and thus produced hemiplegia. In a second experiment 
they found that division of the posterior three-fourths produced also hemiplegia, but 
accompanied by hemiansesthesia. 
VuLPiAN,tt having extirpated the right sigmoid gyi’us 183 days previously, the 
right internal capsule was found, mortem, to be “much thinner” tlian that 
of the left side. 
* ‘ Archiv' fiir Pathologische Anatomie and Physiologle and fiir Klinische Medicin,’ vol. 71, 1877, 
p. 280. 
f “Weitere Mittheilnngen iiber die Extirpation circarascripter Hirnrindenregionen, &c.” ‘ Archiv 
fiir Psycliiatrie and Nervenki’ankheiten,’ vol. 12, 1882, p. .53.5. 
f Loc. cit., p. 141. 
§ ‘ Arcbiv far Psycliiatrie,’ &c., vol. 2, 1870, p. 693. 
II ‘ Correspondenzblatt fiir Scbweizer Aertzte,’ vol. 2, p. 79. 
^ Note on the “ Excitation of the Sarface of the Cerebral Hemispheres by ladaced Carrents,” 
‘ Roy. Soc. Proc.,’ vol. 22, p. 368, 1874. 
** “ Sar les Fonctions des Hemispheres Cerebraax,” ‘ Archives de Ph 3 -£iologie, vol. 2, 1875, p. 465. 
tf ‘Archives de Physiologie,’ vol. 3, 1876, p. 814. 
H 2 
