. Text-book of anatomy and physiology for nurses. 2 Inferior maxillary, or united, form the maxilla. mandible i Nasal bones {os nasale, sing.).—Right and left. (Fig. 11.)They are fiat in structure and form the bridge of the nose, beingjoined to each other in the median line of the face and to the frontalbone above. BONES OF THE FACE. 21 Lacrimal bones (os lacrimale, sing.).—Right and left; smalland thin, situated in the walls of the orbits, just under the ex-tremity of the supraorbital margin (Figs, ii and 23). In this boneis the beginning of the canal in which the lacrimal duct runs con-veyin
. Text-book of anatomy and physiology for nurses. 2 Inferior maxillary, or united, form the maxilla. mandible i Nasal bones {os nasale, sing.).—Right and left. (Fig. 11.)They are fiat in structure and form the bridge of the nose, beingjoined to each other in the median line of the face and to the frontalbone above. BONES OF THE FACE. 21 Lacrimal bones (os lacrimale, sing.).—Right and left; smalland thin, situated in the walls of the orbits, just under the ex-tremity of the supraorbital margin (Figs, ii and 23). In this boneis the beginning of the canal in which the lacrimal duct runs con-veying the tears into the nose, thus preventing them from over-flowing the eyelids and running down the cheek. Zygomatic bones {os zygomaticum, sing.).—^Forming the promi-nences of the cheek (Fig. 11). They are especially noticeablein certain races, as the Chinese, for example, who have high cheekbones. Maxilla (or upper jaw-bone).—Situated in the front of theface, and composed of the two superior maxillary bones joined Infraorbital foramen. Articulates with zygo-matic bonePosterior dental canals Canine eminence ^jff Tuberosity Fig. 14.—Tile Maxilla.— (Alorris.) together below the nostrils. It supports the cheeks, helps to formthe nose and also the floor of the orbits. It consists of a body andseveral processes. The body is hollow, the space being called the maxillary sinusor antrum of Highmore which opens into the side of the nasalcavity. In the lower border of the body the teeth are imbedded,the sockets of the large teeth being in the floor of the antrum,which explains how a diseased tooth may lead to antrum trouble. The foramen on the surface of the body just below the orbit is called theinfraorbital foramen. It is on a line with the supraorbital foramen of thefrontal bone already mentioned. Processes.—The frontal process extends upward along theside of the nasal bone to join the frontal. The palate process 22 ANATOMY AND PHYSIOLOGY FOR NURSES. is in the roof of the
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