. 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 by a plate of bone. The sinus communicates with the palatine sinus freely over the infraorbital canal through an oval opening aljout two to three inches (ca. 5 to c
. 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 by a plate of bone. The sinus communicates with the palatine sinus freely over the infraorbital canal through an oval opening aljout 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 opposite side by a median septum. It extends 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 with the maxillary sinus over the infraorbital canal, so that the cavity is sometimes regarded as a part of that sinus. The large defect in the bony roof of the sinus is closed by two layers of mucous. ?Ox; La . View withopt Ma Fig. 143.—S The maxillary, lacrimal, and turbinate sinuses have been opened, and part of the orbital margin removed, a, Cavity of dorsal turbinate bone: b. lacrimal sinus; c, maxillary sinus; d, communication between maxillary and palatine sinuses: e, opening between maxillary and lacrimal sinuses: /, thin osseous bulla: s, lacrimal bulla; h, orbit; i-6, cheek teeth; 7, nasal bone; 8, premaxilia (nasal process); 9, maxilla; 5', infraorbital foramen; 10, frontal bone; 11, lacri- mal bone; 13, malar bone; 13, fissure between nasal bone and maxilla; i^, temporal bone (squamous); /5, external acoustic meatus; )(?, paramastoid process: ?7, occipital condyle; 7^, palate bone (perpendicular part); 7P, pterygoid bone (hamulus); ,80, tympanic part of temporal; 20',
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