. The anatomy of the domestic animals. Veterinary anatomy. BONES OF THE THORACIC LIMB 145 the bifurcation of the zygomatic process of the malar. It also extends upward and backward through a large opening into a cavity formed by the lacrimal, frontal, ethmoid, and turbinal bones, at the medial side of the orbit.' The floor of the cavity is irregular and the roots of the last three or four cheek teeth project up into it, covered b>- a plate of bone. The sinus communicates with the palatine sinus freely over the infraorbital canal through an oval opening about two to three inches (ca. 5 to 7.
. The anatomy of the domestic animals. Veterinary anatomy. BONES OF THE THORACIC LIMB 145 the bifurcation of the zygomatic process of the malar. It also extends upward and backward through a large opening into a cavity formed by the lacrimal, frontal, ethmoid, and turbinal bones, at the medial side of the orbit.' The floor of the cavity is irregular and the roots of the last three or four cheek teeth project up into it, covered b>- a plate of bone. The sinus communicates with the palatine sinus freely over the infraorbital canal through an oval opening about two to three inches (ca. 5 to cm.) long. Above this it communicates by a shorter and much narrower opening with the middle meatus nasi. The palatine sinus is excavated in the hard palate, and is separated from that of the opp(jsite side by a median septum. It expends from the posterior border of the palate to a plane an inch or more ( to 3 cm.) in front of the first cheek tooth. As mentioned above, there is a large communication T\ith the maxillary sinus over the infraorbital canal, so that the ca^^ty is sometimes regarded as a part of that sinus. The large defect in the bonv roof of the sinus is closed bv two lavers of mucous. Fig. 143.—Skull of Ox; Later-\l View without Maxdible. The maxiliarj'. lacrimal, and turbinate sintises have been opened, and part of the orbital margin removed, a, CaWty of dorsal turbinate bone: b, lacrimal sinus: c, maxiUarj' sinus; d, communication between maxillar>' and palatine sinuses: e, opening between maxillar>' and lacrimal sinuses; /, thin osseous bulla; g, lacrimal bulla; h, orbit; t-6, cheek teeth: 7, nasal bone; S, premajdlla (nasal process); 9, maxilla; 9*, infraorbital foramen: 10, frontal bone; 11, lacri- mal bone: 13, malar bone; 13, fissure between nasal bone and maxilla; ?4. temporal bone (squamous); 25, external acotistic meatus: iff, paramastoid process; /7, occipital condyle: /5, palate bone (perpendicular part); /5, pter>'goid bone (hamulus);
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
