. The anatomy of the domestic animals . Veterinary anatomy. 512 RESPIRATORY SYSTEM OF THE HORSE mass IS composed, there are three principal and numerous small passages, the ethmoidal meatuses (Meatus ethmoidales). The choanae or posterior nares are two elliptical orifices by which the nasal cavity and pharynx commmricate. They are in the same plane as the floor of the. Parotid ExUrnal Mandibular duct maxillary lymph glands vessels Fig. 455.—Cross-section of He.^d of Horse. The section is cut midway between the medial canthus and the anterior end of the facial crest and is a front view. 1, Sept
. The anatomy of the domestic animals . Veterinary anatomy. 512 RESPIRATORY SYSTEM OF THE HORSE mass IS composed, there are three principal and numerous small passages, the ethmoidal meatuses (Meatus ethmoidales). The choanae or posterior nares are two elliptical orifices by which the nasal cavity and pharynx commmricate. They are in the same plane as the floor of the. Parotid ExUrnal Mandibular duct maxillary lymph glands vessels Fig. 455.—Cross-section of He.^d of Horse. The section is cut midway between the medial canthus and the anterior end of the facial crest and is a front view. 1, Septum nasi; 2, 3, 4, dorsal, middle, and ventral meatus nasi; 5, common meatus nasi; G, cavity of dorsal turbinate bone (i. e., turbinate part of frontal sinus); 7, cavit\' of ventral turbinate bone (i. c, turbinate part of maxillary sinus); .'^, maxillary .sinus; 9, communication between 7 and S over infraorbital canal; 10, naso-lacrimal duct; 11, infraorbital nerve and canal; 12, m. levator labii superioris proprius; 13, mouth ; 14, palatine artery; 15, fifth upper cheelc tooth {posterior part); 16, sixth lower cheek tooth (anterior part); 17, m. buccinator; IS, hard palate; 19, vena reflexa; 20, superior buccal glands; 21, buccinator vessels and nerve; 22, alveolar vessels and nerve of mandible; 23, lingual ; 24, mm. genio-glossi; 25, m. hj-o-glossus (number placed between two radicles of lingual vein); 26, m. ; 27, m. mylo-hyoideus; , m. genio-hyoideus; 29, lingual ner\'e; 30, h,\'poglossal nerve; 31. sub- lingual artery; 32, m. digastricus (anterior belly). The mandibular duct is shown in the fat lateral to the genio-hyoideus but is not marked. nasal cavity, and are separated from each other by the vomer. They are, taken together, about two inches (ca. 5 cm.) wide and three to four inches (ca. 8 to 10 cm.) long. The nasal mucous membrane (Membrana mucosa nasi) is thick, highly vas- cular, and is, in general, firmly attached to the underlying p
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