Quain's elements of anatomy . 24 Fig. 246. — Different VIEWS OF A PORTION OPTHE SPINAL CORD FROMTHE CERVICAL REGION?WITH THE ROOTS OFTHE NERYES. Slightly enlarged (Allen Thom-son). In A, the anterior sur-face of the specimen issho-ma, the anterior nerve-root of the right sidehaving been divided ; inB, a view of the right sideis given ; in C, the uppersurface is shown ; in D,the nerve-roots and gan-glion are shown frombelow. 1, the anteriormedian fissure; 2, pos-terior median fissure ; 3,antero-lateral impression,over which the bundles ofthe anterior nerve-root areseen to spread (this im-pressi
Quain's elements of anatomy . 24 Fig. 246. — Different VIEWS OF A PORTION OPTHE SPINAL CORD FROMTHE CERVICAL REGION?WITH THE ROOTS OFTHE NERYES. Slightly enlarged (Allen Thom-son). In A, the anterior sur-face of the specimen issho-ma, the anterior nerve-root of the right sidehaving been divided ; inB, a view of the right sideis given ; in C, the uppersurface is shown ; in D,the nerve-roots and gan-glion are shown frombelow. 1, the anteriormedian fissure; 2, pos-terior median fissure ; 3,antero-lateral impression,over which the bundles ofthe anterior nerve-root areseen to spread (this im-pression is too distinctin the figure); 4, postero-lateral groove into whichthe bundles of the pos-terior root are seen to sink ; 5, anterior root; 5, in A, the anterior root divided andturned upwards ; 6, the posterior root, the fibres of which pass into the ganglion, 6 ;7, the united or compound nerve ; 7, the posterior primary branch, seen in A and D tobe derived in part from the anterior and in part from the posterior side of the cord, corresponding with the line of attachment of the pos-terior roots of the spinal nerves. It is named the jyostero-Iatercd groove(fig. 246, c, 4). Each lateral half of the cord is divided superficially bythe postero-lateral groove into a posterior and an antero-lateral attachment of the anterior roots, however, subdivides the latter intoanterior and lateral portions. An antero-lateral groove is often described in the line of orig-in of the ante-rior roots of the nerves, but has no real existence. The fibres of these rootsin fact, unlike the posterior, do not dip into the spinal cord in one narrow line,but spread over a space of some breadth. On the posterior surface of the cord, at least in the upper part, there 266 THE SPINAL CORD. are two slightly marked longitudinal furrows (fig. 243, 9,9) situated oneon each side, about one millimeter from the posterior median fissure,and marking off, in the cervical region, a slender tract (pos
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