On the localisation of movements in the brain / by J. Hughlings Jackson.
- Jackson, John Hughlings, 1834-1911.
- Date:
- [1875]
Licence: Public Domain Mark
Credit: On the localisation of movements in the brain / by J. Hughlings Jackson. 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.
20/90
![striatum. But the plan of representation is not that some units contain x largely only, as x3, others y largely only, as ys} but that each unit contains x, y, and z—some, let us say, as x3, if, z, others as x2, if, z, &c. When we come to the still higher evolution of the cerebrum, we can easily under- stand that, if the same plan be carried out, a square inch of convolution may be wanting, without palsy of the face, arm, and leg, as x, y, and % are represented in other convolutions; and we can also easily understand that discharge of a square inch of convolution must put in excessive movement the whole region [face, arm, and leg], for it contains processes repre- senting x, y, and z, with grey matter in exact proportion to the degree of complexity.” The two following quotations are from the Medical Mirror, Oct., 1869 : As in the former ones it is assumed that the cere- bral hemispheres represent movements, and here the conclusion is stated that the whole of the gross movements of the body are represented in each cerebral hemisphere. “ The cerebl'al region, of which the corpus striatum is part, consists of units, each one of which represents movements of the whole of the so-called voluntary muscles of the two sides of the body; although, no doubt, each unit will represent a different grouping of them. Thus we have arrived at a minute degree of interrelation of movements, and it is presumable that this is carried to a still greater extreme in the anterior and posterior lobes with processes of incoming sensations.” The following further quotation from the same article shews the application of the Principle:—“When in the cerebrum we have arrived at an interrelation so great that each part of that organ contains processes for movements of the whole of the body, we can, as aforesaid, understand that destruction of much of that organ may lead to no symptoms; but if part of the grey matter of the organ be not destroyed but unstable, it is plain that there must be symptoms by its discharge.”](https://iiif.wellcomecollection.org/image/b22355078_0022.jp2/full/800%2C/0/default.jpg)
