52 
DR. 0. BEEVOR AND MR. V. HORSLEY ON THE EXCITABLE 
Pitres* * * § found marked descending degeneration in tlie Dog and Cat, after ablation 
of the excitable cortex, around the crucial sulcus. The major part of the degeneration 
ceased at the lower limit of the bulb. 
GuDDENt found that extii’pation of the frontal region (stirnhirn) in young Dogs 
produced atrophy of the “ medial part of the peduncle,” corresponding pyramid and 
spinal cord. 
Lowenthal| found that in the Dog, after removal by Professor Herzen of the 
left sigmoid gyrus, some of the lenticulo-striate filires were atrophied just in front 
of the genu, and that, of the posterior limb, the fibres composing its anterior third 
were also atrophied. In a section taken lower down, just above the level of the 
anterior commissure, the portion of the posterior limb of the internal capsule found to 
be degenerated proved to be the second and third fifths from before back. 
A section through the upper part of the crus showed the inner two-thirds to be 
degenerated ; while in a section lower down— i.e., opposite the exit of the third nerve 
—the middle third only w'as degenerated. 
Franck and Pitres§ obtained, on excitation of the internal capsule in the Dog, the 
following results :— 
Dividing the capsule into motor fasciculi, they found the arrangement from before 
backwards to be as follows :— 
Opening of eyelids and dilatation of pupils ; 
Movement of opposite fore foot only ; 
Associated movements of both opposite limbs ; 
Movement of opposite hind limb only ; 
Closing eyelids ; 
Pricking of the opposite ear. 
Veyssiere,!! by a special instrument, produced hemianiesthesia by a lesion of the 
posterior third of tlie hinder limb of the internal capsule. 
Quadrumana. 
Schafer*! noted the follow'ing facts in a Monkey previously operated on by Professors 
Ferrier and Yeo ;— 
The parts removed were the ascending frontal gyrus, except a small portion at the 
* ‘ Coiiipte.s Rendus de J’Academie des Sciences,’ vol. 99, July, 1884, p. 90. 
t Lor . cit. 
X “La Region pyi-nmidale de la Capsule Interne chez le Clilen, et la Constitution du Cordon antero¬ 
lateral de la Moelle.” ‘ Revue Medieale de la Suisse Romaiade,’ vol. 6, p. 529, Plates VII. and VIII., 1886. 
§ ‘Lemons sur les Fonctious Motrices du Cerveau,’ &c., par Franck. Paris, 1887, pp. 21, 22. 
II ‘ Recherches Cliniques et Experiinentales sur I’Hemianaesthesie de Cause Cerebrate,’ 1874. 
^ “ Report on the Lesions, Primai’y and Secondary, in the Brain and Spinal Cord of the Macacque 
Monkey exhibited by Professors Ferrier and Yeo.” ‘ Journ. of Physiology,’ vol. 4, Nos. 4 and 5, Dec., 
1883, p. 323, Plate Xll. 
