. Le cheval dans l'étable et le domaine : sa gestion de la santé et de la maladie. moelle épinière, whileat le même temps il donne passage à ses nerfs. Par cette foi-mationit est beaucoup moins susceptibles aux blessures, et aussi plus utile pour loco-motion, que si elle était faite d'un seul bloc d'os, qui, longueur, fromits serait facilement cassé. De la tête et le visage, ET DE L'ARC HYOÏDIEN. Anatomistes modernes, à la suite de l'idée première a suggéré d byMaclise et Owen, examiner la tête comme composé de six vertèbres;la partie postérieure de l'une, ou celui qui est le plus proche de la COU, étant le occipitalbone, les deux prochaines bei

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. The horse in the stable and the field : his management in health and disease. spinal cord, whileat the same time it gives passage to its nerves. By this foi-mationit is far less liable to injury, and also more useful as an aid to loco-motion, than if it were made of one solid piece of bone, which, fromits length, would be readily broken. OF THE HEAD AND FACE, AND OF THE HYOID ARCH. Modern anatomists, following out the idea first suggested byMaclise and Owen, consider the head as made up of six vertebrae;the posterior one, or that nearest to the neck, being the occipitalbone, the next two being made up of the temporal bone, and theultimate vertebra? c(nisisting of the sphenoid and asthmoid bones.This is a somewhat fanciful hypothesis, when worked out in detail;but it is obvious that the several bones of the skull subserve thesame purposes as the vertebrae, and resemble those parts of theskeleton in forming a series of irregular arches to protect the2-> 254 THE HORSE. brain, the division into separate pieces being far more secure thanif the whi)le were in one.. FIG. 1.—PROFILE VIEW OF THE HEAD AND FACE. 1. Occiput. 2. Parietal bone. 3. Frontal bone. 4. Petrous portion of temporal bone. 5. Zygomatic arch.B. Lachrymal bone. 7. Malar bone. 8. Posterior maxillary bone.9—11. Nasal bone. 10. Anterior maxillary bone. 11. Temporal tbs»a. 12. 13. Lower jaw. The bones of the face, including the lower jaw and oshyoides, depend from the neural arch or brain-case much in thesame way as the ribs and pelvic bones posterior to them are at-tached to the vertebrae, and though they enclose organs of less vitalimportance, yet they are perfectly analogous to these parts in theirtypes and in the offices which they perform. OF THE THORACIC ARCH AND ANTERIOR EXTREMITIES. Lying in the horse at some distance posteriorly to thethree first segments of the haemal arch (the bones of the face, lowerjaw, and os hyoides), and separated from them by the neck, wherethere is a hiatus, the thor

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