. The anatomy of the domestic animals. Veterinary anatomy. 510 RESPIRATORY SYSTEM OF THE HORSE encloses the cartilaginous prolongation of the ventral turbinate bone.' The extrem- ity of the cornu usually causes a slight projection of the skin a short distance behind and below the inferior commissure. The muscles of the nostrils have been described (p. 258). Vessels and Nerves.—The arteries are branches of the palato-labial, superior labial, and lateral nasal arteries, and the blood is conveyed away by corresponding veins. The lymph vessels go to the mandibular lymph glands. The nerves are deri
. The anatomy of the domestic animals. Veterinary anatomy. 510 RESPIRATORY SYSTEM OF THE HORSE encloses the cartilaginous prolongation of the ventral turbinate bone.' The extrem- ity of the cornu usually causes a slight projection of the skin a short distance behind and below the inferior commissure. The muscles of the nostrils have been described (p. 258). Vessels and Nerves.—The arteries are branches of the palato-labial, superior labial, and lateral nasal arteries, and the blood is conveyed away by corresponding veins. The lymph vessels go to the mandibular lymph glands. The nerves are derived from the infraorbital nerve (sensory) antl from the facial nerve (motor). The nasal cavity is divided into two symmetrical halves by the median septum nasi (Figs. 452, 455, 456). The osseous septum (Septum nasi osseum) is formed behind by the perpendicular plate of the ethmoid and ventrally by the vomer. A few ridges on the former correspond to the ethmoidal meatuses. The major part of it, however, is formed by the cartilage of the septum nasi (Car- thago sppti nasi). The surfaces of the cartilage are marked by faint grooves for the vessels and nerves which course over it. The dorsal border is attached along the frontal and nasal sutures, and extends beyond the apices of the nasal bones about two inches (ca. 5 cm.). From this border a thin, narrow plate, the parietal cartil- age (Cartilago parietalis) curves outward for a short distance on either side. Near the nostrils these plates are somewhat wider, partially making good the tlefect (naso-maxillary notch) in the bony wall of the cavity in this situation. The ventral border is thick and rounded; it lies in the groove of the vomer and the pala- tine processes of the premaxillae; its anterior part occupies the space between the premaxillary bones. A process from it extends into the palatine fissure, which it almost completely fills; the pala- tine end of the process lies in the submucous tissue of the hard palate, and the
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