[Introductory lecture, read before the City of London Medical and Chirurgical Society on Tuesday, the 8th of June, 1830].

  • Firth, Thomas
Date:
[1830]
Catalogue details

Licence: Public Domain Mark

Credit: [Introductory lecture, read before the City of London Medical and Chirurgical Society on Tuesday, the 8th of June, 1830]. 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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    sidered softer than the white, but when viewed through a microscope^ it presents the sanie globular appearance. The white and oineritious portions of the brain are inter- mixed in various ways: in some parts a covering of the brown surrounds a portion of the white; at other times a strata of one surrounds a strata of the other, presenting uniformity of order in all its parts. The cerebellum presents an appearance different to the cerebrum, but we are told this seeming difference arises not from a greater portion of grey matter than in thie cerebrum, but from the manner in which it is mixed with the white matter. iv i In-describing the membraneous coverings of the train, it is usual to include the dura mater with the pia mater and arachnoid membrane; but some anatomist's have considered it only as a covering of the inner-surface of the cranium.- ' . • -^^ f'«'t* ^'?].-'->-.-?'V'5»«- in-.l'^inn rn/ii' The pia mater lies immediately undei the dura mater, and is wholly made up of blood-vessels for the supply and nourishment of the brain. Bichat describes this mem- brane as having a cellular tissue ; but the anatomists <i)f this country have not been able to discover it, nor can a:bsorbents Of nerves be therein observed; This mem- brane, in some of its parts, presents an appearance of white threads, so very minute that anatomists have not as yet been able to determine whether they are blood- Vessels or otherwise. The arachnoid, or third covering '6f the brain, takes its name from the strong resemblance tt bears to a spider's web, and differs from tbe membrane last described not only in structure but in its distribution. It is very compact; its colour Is tiearly imperceptible, being almost transparent; and it is free from blood- •v^ssels, absorbents, and nerves.'- i