. L'anatomie du cheval, une dissection guide. Les chevaux. La dissection de l'arrière et le thorax. Foramen 141 dans le cou une branche de l'artère vertébrale pénètre dans le canal rachidien. Dans l'arrière de l'entrée des branches similaires dorso-spinal de la division des artères intercostales, dans les reins les branches émanent de l'Inmbar les artères, et dans la région sacrée de l'artère sacrale latéral. En règle générale, les branches entrant par anastomose foramina adjacente, puis dégager les branches pour le cordon et les corps vertébraux. Les Veines de la moelle épinière sont tortueux, et forme à sa surface un plexus de whi

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. The anatomy of the horse, a dissection guide. Horses. DISSECTION OF THE BACK AND THORAX. 141 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 Inmbar 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 receive also veins from the vertebral bodies, and they are drained by vessels that issue by the intervertebral foramina to join the vertebral, intercostal, lumbar, or lateral sacral veins. Directions.âFor the examination 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 hardening fluid for at least a week. A portion from the spinal cord of any of the domestic animals will serve the purpose ; but, from its larger size, that of the horse is to be pre- ferred. â Stbuctube of the Spinal Cord. The meninges having been removed, the student will note the following points regarding the surface of the cord :âIt approaches the cylindrical m lorm, but is ' â ? slightly flattened above and below. It is traversed in the longitudinal direction by three fissures, and a fourth is sometimes de scribed. The superior med ian fissure is a narrow interval extending into the cord along the middle line of its upper face. It is occupied by neuroglia. The inferior median fissure is an actual cleft penetrating the cord along the middle line of its lower face. It is occupied by a process of pia mater. The supero- lateral fissure is a faint surface depression extend- ing on the side of the cord, along th

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