. The anatomy of the domestic animals. Veterinary anatomy. 84 THE SKELETON OF THE HORSE overhung by the ventral turbinate bone; it is much the largest and is the direct path between the nostrils and posterior nares. The osseous nasal aperture (Apertura nasi ossea) is bounded by the nasal bones and the premaxillffi. The jMisterior extremity or fundus is separ- ated from the cranial cavity by the cribriform plate of the etlimoid, and is largely occupied by the lateral masses of that bone. THE PARANASAL SINUSES Connected tlirectly or indirectly with the nasal cavity, of which they are diverticula
. The anatomy of the domestic animals. Veterinary anatomy. 84 THE SKELETON OF THE HORSE overhung by the ventral turbinate bone; it is much the largest and is the direct path between the nostrils and posterior nares. The osseous nasal aperture (Apertura nasi ossea) is bounded by the nasal bones and the premaxillffi. The jMisterior extremity or fundus is separ- ated from the cranial cavity by the cribriform plate of the etlimoid, and is largely occupied by the lateral masses of that bone. THE PARANASAL SINUSES Connected tlirectly or indirectly with the nasal cavity, of which they are diverticula, are four pairs of air-sinuses (Sinus paranasals), viz., maxillarj^, frontal, sphenopalatine, and ethmoidal. Tiie maxillary sinus (Sinus maxillaris) is the largest. Its lateral wall is formed bj^ the maxilla, the lacrimal, and the malar. It is bounded medi- ally by the maxilla, the ventral turljinate, and the lateral mass of the ethmoid bone. It extends backward to a transverse plane in front of the root of the supraorbital process, and its anterior limit is indicated approximately by a Une drawTi from the anterior end of the facial crest to the infraorbital foramen. Its dorsal boundary cor- responds to a line drawn backward from the in- fraorljital foramen parallel to the facial crest. The ventral wall or floor is formed by the alve- olar part of the maxilla; it is very irregular and is crossed by bony plates running in various directions. The last three cheek teeth project up into the cavity to an extent which varies with age; they are covered by a thin jjlate of bone. The cavity is divided into anterior and posterior parts by an oblique septum (Septum sinus maxillaris). The lateral margin of the sep)- tum is commonly about two inches (ca. 5 cm.) from the anterior end of the facial crest; from here it is directed inward, backward, and u]> ward. The upper part of the septum (formed bj' the posterior end of the ventral turbinate bone) is very delicate and usuallj' cribrifor
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
