The circulatory apparatus in general paralysis of the insane / by T. Duncan Greenlees.

  • Greenlees, T. Duncan.
Date:
1904
Catalogue details

Licence: In copyright

Credit: The circulatory apparatus in general paralysis of the insane / by T. Duncan Greenlees. Source: Wellcome Collection.

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    this space must not be mistaken for the perivascular space which occurs normally. The nuclei of the adventitial sheath are oblong in shape, but more rounded in its innermost layers. This membrane is a direct continuation of the pia mater, the fibres of which may be seen to dip down into the cortex along with the vessels which they surround. The j^einvascular space is the interval between the tunica adventitia and the brain substance, and has been termed the lymph space” of His. In fresh sections of the brain these Fig. 2. Showing' scheme of relationship between minute cerebral artery, a cell, and vein, by means of the perivascular and pericellular spaces. A, artery ; T', vein. spaces are not so well demonstrated as they are in hardened sections, but they are specially evident (even in fresh sections) in atrophy of the brain. Microscopically they are observed to communicate with spaces which surround the cerebral cells, called the “ pericellular spaces.” No lining membrane, apart from that formed by the adventitial coat on the one side, and the brain substance on the other, has been described, although Batty Tuke ^ shows these spaces as if lined with epithelial cells. The fact that the perivascular spaces are more evident in hardened sections than in fresh preparations of the brain proves, according to Obersteiner,^ who first drew attention to ^ Batty Take, Morisonian Lectures—Brain Exhaustion. Obersteiiier, Anatomy of the Nervous System.
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