Notes of researches on the intimate structure of the brain : second series / by J. Lockhart Clarke, Esq.

  • Clarke, J. Lockhart (Jacob Lockhart), 1817-1880.
Date:
[1861]
Catalogue details

Licence: Public Domain Mark

Credit: Notes of researches on the intimate structure of the brain : second series / by J. Lockhart Clarke, Esq. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    [From the Peoceedings of the Eoyai Society/o>- June 20, 1861.] NOTES OF RESEARCHES ON THE INTIMATE STRUCTURE OF THE BRAIN. [SECOND SERIES.] By J. LOCKHART CLARKE, Esq. In consequence of the frequent interruptions to which I am ne- cessarily exposed in the course of my anatomical investigations, I beg to communicate to the Royal Society, in the form of notes, some of the results at which I have arrived, with a promise to forward, in a few months, a complete memoir on the same subject, with the necessary illustrations. In my memoir of the Medulla Oblongata, it is shown that the post-pyramidal ganglion, or grey substance of the posterior pyramid, is developed from the posterior grey substance on each side of the posterior median fissure. At the point of the calamus scriptorius, it is intimately connected vnth the pyriform nucleus of the vagus nerve, each receiving a process from the other. Between these two, and apparently developed from the substance of both, which are intimately blended with it, there arises a convex and somewhat trian- gular mass, which becomes the principal nucleus of the auditory nerve. In a transverse section it is triangular, one of its angles projecting forwards into the root of the caput cornu posterioris, o r expanded extremity of the posterior horn. It is interspersed with numerous large nerve-cells, which are round, oval, triangular, or otherwise irregular, and of considerable size, the largest measuring the 800th of an inch in diameter. Another portion of the auditoiy nucleus is in contact with the outer side of that just described, and with the inner side of the restiform body. It consists of the outer part of the posterior pyramid in the form of a remarkable network, enclosing in its meshes longitudinal fasciculi, and containing large nerve-cells with branched and exceedingly long processes, which contribute to form the network. From both these parts of the nu- cleus the posterior division of the auditory nerve takes its origin, and winds outward as a broad convex band over the restiform body. In this course it contains, at first, a few small cells, elongated in the di- rection of its fibres ; but as it proceeds, its cells become gradually larger and more numerous, until at the anterior Ijorder of the restif B