. L'anatomie du cheval : un guide de la dissection. Les chevaux, les chevaux -- Anatomie. 144 L'ANATOMIE DU CHEVAL. la bifurcation de l'artère cérébro-spinale. Le milieu de l'artère vertébrale passe en arrière sous la fissure médiane inférieure de la corde. Ses branches sont distribués à la moelle épinière et ses membranes. Comme il passe en arrière en libérant ses branches il est renforcé par d'autres artères qui pénètrent à l'foramina intervertébraux. Ainsi, à chaque foramen intervertébral dans le cou une branche de l'artère vertébrale pénètre dans le canal rachidien. Dans l'arrière de l'entrée des branches similaires dorso-spinale o division

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. The anatomy of the horse : a dissection guide. Horses; Horses -- Anatomy. 144 THE ANATOMY OF THE HORSE. the bifurcation of the cerebro-spinal artery. The middle spinal artery passes backwards beneath the inferior median fissure of the cord. Its branches are distributed to the cord and its membranes. As it passes backwards giving off its branches it is reinforced by other arteries entering at the intervertebral foramina. Thus, at each intervertebral foramen in the neck a branch of the vertebral artery enters the spinal canal. In the back similar branches enter from the dorso-spinal division of the intercostal arteries, in the loins the branches emanate from the lumbar arteries, and in the sacral region from the lateral sacral artery. As a rule, the branches entering by adjacent foramina anastomose, and then give off branches to the cord and the vertebral bodies. The Veins of the Spinal Cord are tortuous, and form on its surface a plexus from which the blood passes into two large veins that lie one at each side of the superior common ligament. These also receive veins from the vertebral bodies, and they are drained by vessels that issue by the intervertebral foramina- to join the vertebral, inter- costal, lumbar, or lateral sacral veins. Directions.—For* the ex- amination of the structure of the spinal cord, a few inches of it with the roots of the nerves intact should be procured and kept in spirit or some other harden- ing fluid for at least a week. A portion from the spinal cord of any of the do- mestic animals will serve the purpose; but, from its larger size, that of the horse is to be pre- ferred. Structure of the Spinal Cord. The meninges having been removed, the student will note the following points regarding the surface of the cord : It approaches the cylindrical in form, but is slightly flattened above and below. It is traversed in the longitudinal direction by two median fissures, and two lateral fissures are generally described as being present on eac

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