Archive image from page 659 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 ri'irC 'Hffe, 31 Dura mater of part of the spinal cord laid open to show the ligamciitum deiitatum. d d d d, dentated processes. On the right the roots of the nerves and the ganglia of the posterior roots are retained. all the characters of white fibrous tissue, of which it is chiefly composed. In its dentated processes, however, a considerable quantity of yellow fibrous tissue may be found. The simi- larity of its constitution with that of the pia mater evide
Archive image from page 659 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 ri'irC 'Hffe, 31 Dura mater of part of the spinal cord laid open to show the ligamciitum deiitatum. d d d d, dentated processes. On the right the roots of the nerves and the ganglia of the posterior roots are retained. all the characters of white fibrous tissue, of which it is chiefly composed. In its dentated processes, however, a considerable quantity of yellow fibrous tissue may be found. The simi- larity of its constitution with that of the pia mater evidently justifies its being regarded as a process of that membrane, and not, as some anatomists thought, of the dura mater, with which it has a much less intimate and extensive connexion. Its anterior and posterior surfaces are uncovered by any membrane; they are smooth, and have the glistening silvery appear- ance of white fibrous membrane. It is evident that during life these surfaces must be bathed by the subarachnoid fluid. The office of this remarkable structure seems evidently to be mechanical; to preserve the spinal cord in a state of equilibrium; and to prevent lateral movement of it, whilst at the same time it forms a partition between the roots of the nerves. General remarks on the structure of the nervous centres.—It has already been shewn in a former part of this article that the nerves properly so called are composed exclusively of one kind of nervous substance,—namely, the fibrous nervous matter, which is disposed in bundles of peculiar fibres. It is only in the nervous centres or in continuations of them that we find an union of the white and the grey nervous matter; and, indeed, it may be stated in general, that the peculiar and distinctive anatomical character of a nervous centre con- sists in this combination of the two kinds of nervous matter. In the nervous centres the white matter exhi- bits, for the most part, the same essential cha- racters of structur
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