. The anatomy of the domestic animals . Veterinary anatomy. THE NASAL CAVITY 511 The two turbinate bones project from the lateral wall, and divide the outer part of the cavity into three meatuses—dorsal, middle, and ventral (Figs 454 455,456). The dorsal nasal meatus (Meatus nasi dorsalis) is a narrow passage, bounded dorsally by the roof of the cavity, and ventrally by the ventral turbinate bone; its posterior end is closed by the junction of the inner plate of the frontal bone with the cribriform plate and lateral mass of the ethmoid. It transmits air to the olfactory region. The middle nasa
. The anatomy of the domestic animals . Veterinary anatomy. THE NASAL CAVITY 511 The two turbinate bones project from the lateral wall, and divide the outer part of the cavity into three meatuses—dorsal, middle, and ventral (Figs 454 455,456). The dorsal nasal meatus (Meatus nasi dorsalis) is a narrow passage, bounded dorsally by the roof of the cavity, and ventrally by the ventral turbinate bone; its posterior end is closed by the junction of the inner plate of the frontal bone with the cribriform plate and lateral mass of the ethmoid. It transmits air to the olfactory region. The middle nasal meatus (Meatus nasi medius) is between the two turbinate bones. It is somewhat larger than the dorsal meatus, and does not extend back so far; it ends near the great ethmoturbinate and the ethmoidal meatuses. In its posterior part is the extremely narrow, slit-like interval by which the max- illary sinus communicates with the nasal cavity—the naso-maxillary opening (Aditus naso-maxillaris). The opening, which is normally a mere fissure, is not visible from the nasal side, being concealed by the overhanging dorsal turbinate. A fine flexible probe, passed outward and somewhat backward between the turbinate Ventral meatus Ventral turbinate Dorsal turbinate litlimo- Septum between Dorsal turbinates frontal sinuses. Fig. 454.—Nasal Cavity of Horse; .Section with Septum Removed, 1, Dorsal turbinate fold; ^, alar fold, containing cartilaginous prolongation of ventral turbinate; 3, arrow pointing to naso-maxillary opening, wliich is concealed by dorsal turbinate bone; J/, cranial cavity; 5, sphenoidal sinus; 6, hamulus of pterygoid bone. The olfactory mucous membrane is shaded. Dotted lines indicate anterior limit of uncoiled parts of turbinate bones, which inclose parts of frontal and maxillary sinuses. bones, enters the maxillary sinus; if introduced a little further in the same direction, it usually passes through the orifice of communication between the maxillary
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