Structure and development of the brain : a lecture delivered in the City Hall, Glasgow, under the auspices of the Glasgow Science Lectures Association / by Allen Thomson.
- Allen Thomson
- Date:
- 1879
Licence: Public Domain Mark
Credit: Structure and development of the brain : a lecture delivered in the City Hall, Glasgow, under the auspices of the Glasgow Science Lectures Association / by Allen Thomson. 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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![ascend through the pons Yarolh at a small depth from its anterior surface, and form the lower part or crust, of the crura cerebri. Thence they penetrate for the most part the corpora striata, and are believed to be connected with its grey nuclei, more especially the nucleus lenticularis. It is doubtful whether any of its fibres pass into the cerebral hemispheres without having been previously united with grey ^ cprebra] peduncle differs greatly from the lower in having its fibres much intermixed with grey substance. It consists mainly of fibres prolonged upwards from a part, probably the sensory part, of the lateral column of the spinal marrow, together with a portion of the posterior column, and it is generally regarded as a channel of sensory conduction. Along with the foregoing, it receives from behind an accession in the processus a cerehello ad cere- brum, and a part of the combined fibres may pass into the corpora quadrigemina lying immediately above the crura CGrcbri d. The remaining parts of the spinal medullary columns, consisting of a large portion of the posterior, together wit 1 offsets from the lateral and anterior columns, enter into the formation of the restiform body or inferior peduncle of the cerebellum, into which its fibres spread towards the surface, along with the other fibres which enter that body from its superior or cerebral peduncles and from the pons varo n. The last-mentioned body, which appears to be developed in proportion to the size of the lateral masses of the cerebellum, is composed mainly of transverse fibres as it enters the cere- bellum and forms the middle peduncles of that body on the two sides. Crossing from side to side below, and imbed- ding the longitudinal columns which pass from the medulla oblongata into the crura cerebri, it appears at first sight to be mainly a transverse commissure of the cerebellum ; but its fibres are much intermingled with grey substance, and undergo decussation in such a way that they are considered to establish communication between the cruri cerebri of one side, and the opposite side of the cerebellum. The several parts of the great cerebral stalK 01 pecunc e may be considered to terminate in or lead to the various](https://iiif.wellcomecollection.org/image/b22359102_0043.jp2/full/800%2C/0/default.jpg)
