. The anatomy of the domestic animals. Veterinary anatomy. 144 SKELETON OF THE OX the two plates of the bone come together. The cavity is very irregular and is sub- divided into numerous spaces by ridges and partial septa. This multilocular character is most marked in the anterior part, and here several small spaces appear to be cut off from the main cavity. The supraorbital canal passes through the sinus. Several small openings lead from the sinus to the ethmoidal meatuses, and thus indirectly to the upper division of the middle meatus nasi. The communi- cations with the cavity of the dorsal
. The anatomy of the domestic animals. Veterinary anatomy. 144 SKELETON OF THE OX the two plates of the bone come together. The cavity is very irregular and is sub- divided into numerous spaces by ridges and partial septa. This multilocular character is most marked in the anterior part, and here several small spaces appear to be cut off from the main cavity. The supraorbital canal passes through the sinus. Several small openings lead from the sinus to the ethmoidal meatuses, and thus indirectly to the upper division of the middle meatus nasi. The communi- cations with the cavity of the dorsal turbinate and with the lacrimal part of the. Fig. 142.—Skull of Ox; Dorsal View. The outer plate of bone has been removed to show the sinuses, a, Frontal sinus; a', cranial plate of frontal bone; a", anterior part of frontal sinus, which is separated from remainder by a septum (6); c, c', communications between frontal sinus and hasat cavity; d, supraorbital foramen; e, supraorbital canal; /, cavity of dorsal turbinate bone, and ff, its opening into the nasal cavity; A, lacrimal sinus; r, its communication with the maxillary sinus: /:, maxillary sinus; ^, orbit; ^, frontal bone; 7', processus cornus; :2, nasal bone; 5, premaxilla (nasal process); .}, maxilla; 5, lacri- mal bone; 5, malar bone; 7, dotted line indicating course of nasolacrimal duct. (After EUenberger, in Leisering'a Atlas.) maxillary sinus which are seen in the macerated skull are closed in the fresh state by mucous membrane. The maxillary sinus is excavated chiefly in the maxilla, lacrimal, and malar, and is not divided by a septum as in the horse. It extends forward as far as the facial tuberosity, or a little further in old animals. Its dorsal limit is indicated by a line drawn from the infraorliital foramen to the upper margin of the orbit. It is continued into the lacrimal bulla to a point nearly opposite to. Please note that these images are extracted from scanned page images that may
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