Contributions to embryology Volume Ñ. 5 by Carnegie Institution of Washington
Contributions to embryology Volume Ñ. 5 by Carnegie Institution of Washington PDF, ePub eBook D0wnl0ad
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. 1917 Excerpt: ...envelope of the leptomeninges and the central nervous system. But there is a tendency to regard the arachnoid and pia mater as constituting one structure--the leptomeninges or "pia-arachnoid," in the terminology of Middlemass and Robertson39). This difference of opinion in regard to the two inner meninges is due to their structural and intimate relationships. The arachnoid may well be assumed to be a single membrane, worthy of being regarded as a single structure if one considers only its outer continuous membrane as the essential structure. But the inner surface of this membrane sends processes inward to fuse with the pia mater, which is so closely applied to the nervous tissue. These processes divide the subarachnoid space (included between arachnoid and pia) into the well-known meshes in which the cerebro-spinal fluid circulates. From the standpoint of these channels (the subarachnoid spaces) the arachnoid constitutes the parietal and the pia the visceral layer. Thus the intimate structural unity of the two membranes seems, in the opinion of many investigators, to warrant their designation as a single membrane. This view, however, has been strongly opposed by Poirier and Charpy(45), who considered the distinction of three meninges very essential. Hence, in considering the transformation of tissues in the embryo, regard must be had for the dura as a well-differentiated structure, and for the leptomeninges as units, but certainly to be regarded from the standpoint of the subarachnoid spaces. In this connection SterziV53) observations on the comparative anatomy of the meninges are of interest. It will be recalled that the dura in lower forms becomes well established before the leptomeninges emerge from a primitive mesenchyme. THE PERIAXIAL MESENCH...From reader reviews:
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