. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE ANTERIOR LIMBS. 11? the walls of the semilunar sinus, as well as the bony channels which spring from it. Development.—The third phalanx, formed from a single nucleus of ossifica- tion, undergoes numerous changes in its configuration during life. Thus, in the young animal the lateral angles are thick, obtuse,^ and but little prolonged posteriorly ; but as it grows older, they increase in length and become salient. The development they then assume, is due to the progressive ossification of the lateral cartilages impla
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE ANTERIOR LIMBS. 11? the walls of the semilunar sinus, as well as the bony channels which spring from it. Development.—The third phalanx, formed from a single nucleus of ossifica- tion, undergoes numerous changes in its configuration during life. Thus, in the young animal the lateral angles are thick, obtuse,^ and but little prolonged posteriorly ; but as it grows older, they increase in length and become salient. The development they then assume, is due to the progressive ossification of the lateral cartilages implanted on their surface. It often happens, in very old horses that this ossifying process is carried to an extreme degree, and nearly the whole substance of these complementary organs is invaded. From the commencement, its inevitable result is to convert the notch which separates the basilar from the retrossal process into a foramen. The comple me atari/ Jihro-cartilaiiinous apparatus of the as pedis.—To under- stand properly the disposition of this portion of the .foot, it is necessary that a previous knowledge of the ligaments and tendons attached to the os pedis should have been acquired ; therefore a detailed description will be given when the Horse's foot is studied as a whole, in the article on the Sense of Touch. It will be sufficient here to state that this apparatus consists of two lateral pieces—the fibro-cartilages of the OS pedis, united behind and below by iheplantar cushion—a fibrous and elastic mass on which rests the navicular bone, through the medium of the perforans tendon. The Small Sesamoid or Navicular Bone (Figs. 72, 75).—This short bone is annexed to the third phalanx, behind which it is situated ; it is elongated transversely, flattened above and below, and narrow at its extremities. It offers : 1. A superior face, on which are pro- longed the glenoid cavities and the median ridge of the articular surface of the OS pedis ; it articulates with the
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