. Quain's elements of anatomy . In mammals the constricted parts of thechorda are situated within the vertebrae, andthe j)rincipal dilatations are in the inter-vertebral spaces, where they widen out con-siderably, and seem to form the basis of the pulpy or gelatinous substance which occupies the centre of the discs (Luschka, 1856, Kolliker). In osseous fishes the dilatation is also intervertebral, and the growth of thechorda proceeds to such an extent as to give rise to the large double cone of softand gelatinous substance which occupies the conical hollows of the biconcavevertebral bodies. Bu
. Quain's elements of anatomy . In mammals the constricted parts of thechorda are situated within the vertebrae, andthe j)rincipal dilatations are in the inter-vertebral spaces, where they widen out con-siderably, and seem to form the basis of the pulpy or gelatinous substance which occupies the centre of the discs (Luschka, 1856, Kolliker). In osseous fishes the dilatation is also intervertebral, and the growth of thechorda proceeds to such an extent as to give rise to the large double cone of softand gelatinous substance which occupies the conical hollows of the biconcavevertebral bodies. But in birds, reptiles, and amphibia, the dilatations of thenotochord are within the bodies of the vertebra, and as in these animals articularcavities are developed between the vertebrse, the vestiges of the notochord very-soon disappear from the intervertebral spaces, while they remain much longervisible in the bodies (Gegenbaur). In mammals, therefore, the cartilaginous matrix of each vertebral body (and YERTEBKAL COLUMN. 797.
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