. Cunningham's Text-book of anatomy. Anatomy. 144 OSTEOLOGY. cellular above ; it closes in some of the anterior ethmoidal cells and helps to complete the infundibulum. Where it is smoother it forms a part of the lateral wall of the middle meatus of the nose immediately behind the frontal process of the maxilla, and above the inferior concha. The superior border articulates with the orbital part of the frontal; the anterior edge with the posterior border of the frontal process of the maxilla, with which it completes the lacrimal groove for the lodgment of the lacrimal sac. The inferior margin a
. Cunningham's Text-book of anatomy. Anatomy. 144 OSTEOLOGY. cellular above ; it closes in some of the anterior ethmoidal cells and helps to complete the infundibulum. Where it is smoother it forms a part of the lateral wall of the middle meatus of the nose immediately behind the frontal process of the maxilla, and above the inferior concha. The superior border articulates with the orbital part of the frontal; the anterior edge with the posterior border of the frontal process of the maxilla, with which it completes the lacrimal groove for the lodgment of the lacrimal sac. The inferior margin articulates with the orbital surface of the maxilla, and in front by its descending process with the inferior concha. Posteriorly the bone articulates with the anterior border of the lamina papyracea of the ethmoid. Connexions.—The lacrimal bone articulates with four bones—the frontal, ethmoid, inferior concha, and the maxilla. Ossification.—The lacrimal is developed from a single centre, which makes its appearance about the end of the second or the beginning of the third month of intra- uterine life in the membrane around the cartilaginous nasal Palate Maxilla Fig. 154. -The Vomer as seen from the Right Side. Vomer. The vomer or ploughshare bone, a bone of irregular quadrilateral shape, is placed in the posterior part of the nasal septum. It has four borders and two surfaces. The superior border, which can readily be distinguished by the presence on either side of an everted lip or ala, slopes from behind upwards and forwards, and articulates with the inferior surface of the body of the sphenoid, the pointed rostrum of which is received into the groove formed by the projecting alse. Laterally these alse are wedged in between the sphenoidal processes of the palate bones in front, and the vaginal processes at the root of the medial laminas of the pterygoid processes behind. The posterior border, which slopes from behind down- wards and forwards, is free, and forms
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