. Anatomy, descriptive and applied. Anatomy. 138 SPECIAL ANA TOMY OF THE SKELETON The apex is situated at the back of the orbit and corresponds to the optic foramen,' a short circular canal which transmits the optic nerve and ophthalmic artery. It will thus be seen that there are nme openings communicating with each orbit—viz., the optic foramen, sphenoidal fissure, sphenomaxillary fissure, supraorbital foramen, infraorbital canal, anterior and posterior ethmoidal for- amina, malar foramina, and the canal for the nasal duct. The Nasal Cavity.—The nasal cavities {camim nasi), or nasal fossae (F
. Anatomy, descriptive and applied. Anatomy. 138 SPECIAL ANA TOMY OF THE SKELETON The apex is situated at the back of the orbit and corresponds to the optic foramen,' a short circular canal which transmits the optic nerve and ophthalmic artery. It will thus be seen that there are nme openings communicating with each orbit—viz., the optic foramen, sphenoidal fissure, sphenomaxillary fissure, supraorbital foramen, infraorbital canal, anterior and posterior ethmoidal for- amina, malar foramina, and the canal for the nasal duct. The Nasal Cavity.—The nasal cavities {camim nasi), or nasal fossae (Figs. 81 and 103), are two large, irregular cavities situated on either side of the middle line of the face, extending from the base of the cranium to the roof of the mouth, and separated from each other by a thin vertical septum, the septum of the nose, formed by the perpendicular plate of the ethmoid and by the vomer. Each cavity communicates by a large aperture, the anterior nasal aperture {apertura pyriformis),^ with the front of the face, and by the two posterior nares (choance). LACRIMAL CANAL PALATE BONE Fig. 103.—Nasal cavity, right lateral wall, from the left. (Spalteholz.) with the nasopharynx behind. These fosste are much narrower above than below, and in the middle than at the anterior or posterior openings; their depth, which is considerable, is much greater in the middle than at either extremity. The nasal fossse are surrounded by four other fossae—above is the cranial fossa; laterally, the orbital fossae; and below, the cavity of the mouth. Each nasal fossa communicates with four sinuses—the frontal above, the sphenoidal behind, and the maxillary and ethmoidal on the outer wall. Each fossa also communicates with four cavities—with the orbit by the lacrimal groove, with the mouth by the anterior palatine canal, with the cranium by the olfactory foramina, and with the sphenomaxillary fossa by the sphenopalatine foramen; and they occasionally iQuain, Test
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
