This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1845 edition. Excerpt: ...The spinal cord is composed of certain columns of fibrous substance, in which a large number of the fibres take a longitudinal direction. These, in a great degree, enclose a distinct arrangement of vesicular matter, into which, however, as in the cortical layer of the cerebral hemispheres, some, at least, of ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1845 edition. Excerpt: ...The spinal cord is composed of certain columns of fibrous substance, in which a large number of the fibres take a longitudinal direction. These, in a great degree, enclose a distinct arrangement of vesicular matter, into which, however, as in the cortical layer of the cerebral hemispheres, some, at least, of the fibres of the external white matter are continued, intermingling with its elements. It may, therefore, be stated generally that in the brain the vesicular matter is external and cortical, and in the spinal cord it is internal and almost completely surrounded by the white fibrous matter. This difference of arrangement is probably to be ascribed to the fact, that throughout the whole course of the spinal cord nerves are being given off, whilst from the encephalon they come only from certain regions. In these regions the white matter is superficial; but in the hemispheres, from which no nerves proceed, it is deep-seated. We shall describe more minutely the disposition of the two kinds of nervous matter in the cerebro-spinal centre at a future page. Of the Nerves and Neixous Centres in Invertebrate Animals. Fig. 64. The description above given applies to the human subject, and to the vertebrate classes generally. In all essential points, so far as the present state of our knowledge enables us to judge, the structural arrangement of the nerves and nervous centres of the invertebrate classes accords with this. Some differences, however, exist which require to be noticed here. In the lobster, the nerve-tubes are large; the tubular membrane has the same transparent, homogeneous j appearance, which we have noticed in the vertebrata. But it incloses many delicate nuclei at various intervals. Within the tubular membrane there is a very thin layer of...
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