On the descending degenerations which follow lesions of the gyrus marginalis and gyrus fornicatus in monkeys / by E.P. France ; with an introduction by Professor Schäfer.

  • France, E.P.
Date:
1889
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Licence: Public Domain Mark

Credit: On the descending degenerations which follow lesions of the gyrus marginalis and gyrus fornicatus in monkeys / by E.P. France ; with an introduction by Professor Schäfer. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    and is nearer the circumference, leaving, however, a band of healthy fibres in the position of the direct cerebellar tract. Degenerated fibres and slight sclerosis can be seen with the microscope on the same side (left) as the lesion in a similar position. Lumbar Enlargement.—The degeneration here is less in amount. It occupies the angle between the posterior root and the circumference. A few degenerated fibres can be seen in a similar position on the same side as the lesion. Case 2.—No. 12 of First Series. (Figs. 2a to 2d, Plates 27 and 28.) Zesmn.—Ablation of the posterior three-fourths of the left marginal convolution and an adjoining strip of the external surface as far as sulcus x (fig. 2a). The gyrus fornicatus was also somewhat injured. B.esult.—Paralysis of the right side of the trunk and right leg, and partial paralysis of the right arm, which had imperfect power of extension from the shoulder. This animal was killed six months after the operation. Degenerations Observed. The pieces from which sections were cut showed, even with the naked eye, well marked degeneration in the pyramidal bundles in the pons and medulla on the same side as the lesion, and in the spinal cord in the crossed pyramidal tracts of both sides, although much more obviously on the side opposite the lesion. Medulla.—There is well marked, scattered degeneration in the left pyramid (fig. 2b), with considerable shrinking and sclerosis. Spinal Cord.—Cervical Region.—There is a marked triangular patch of degenera- tion in the crossed pyramidal tract on the right side, denser where it borders the direct cerebellar tract, and reaching the circumference near the middle of the lateral border, where it spreads both backwards and forwards, but especially the latter, involving the outer part of the direct cerebellar tract. In a section at the level of the second cervical nerves (fig. 2c) a band of degeneration is seen close to the circumference, extending from the posterior root exit to where the pyramidal tract degeneration reaches the circumference. On the left side there is a small amount of degeneration, scattered over a similar area, and on both sides there is sclerosis in the degenerated areas. Dorsal Region.— Ax the level of the fourth nerves (fig. 2d) the degeneration is very well defined. It extends from the apex of the posterior cornu (right side) outwards and forwards as a diminishing strip, till it reaches the surface about the anterior end of the direct cerebellar tract. There is also a little degeneration along the external border of the direct cerebellar tract, which spreads along the circumference less than in the MDCCCLXXXIX.—B. 2 X