Author Description

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. 1854 edition. Excerpt:...sutural tract on each side, and a hypapophysis below, produced into a recurved point. The hinder facet of the basioceipital is convex, forming the lower half of the oceipital condyle, which is supported on a short peduneular prolongation. The baeioceipita! unites above and laterally with the exoceipitals and alisphenoids, and in front with the basisphenoid, upon which it rests obliquely, and it supports the medulla oblongata on its upper smooth surface. The exoceipitals, 2, 2, are very irregular subtriangular bones; each is produced backwards into a peduneular process, supporting a moiety of the upper half of the oceipital condyle. The outer and fore part of the exoceipital expands into the irregular base of the triangle: it ia perforated by a slit for the eighth pair of nerves; it articulates below with the basioceipital; it is excavated in front to lodge the petrosal cartilage, where it articulates with the alisphenoid; it unites above with the superoceipital. The superoceipital, 3, is of a subrhomboidal form, sends a spine from its upper and hinder surface, expands laterally into oblong processes, is notehed anteriorly, and sends down two thin plates from its under surface, bounding on the mesial side the surface for the cerebellum, and by the outer side forming the inner and upper parts of the acoustic cavities. The superoceipital articulates below with the exoceipitals and alisphenoids, and in front with the parietal, by which it is overlapped in its whole extent. The oceipital vertebra is as if it were sheathed in the expanded posterior outlet of the parietal one (Fig. 17), the centrum resting on the oblique surface of that in front, and the anterior base of the neural spine entering a cavity in and being overlapped by that of the preceding...