. Cunningham's Text-book of anatomy. Anatomy. THE LACEIMAL BOXES. 143 it articulates with the inferior conchal crests on the medial surface of the body of the maxilla and the perpendicular part of the palate bone respectively. Be- tween these two articulations the central part of the superior border rises in the form of a sharp crest, the anterior part of which forms the upstanding processus lacrimalis (lacrimal process) which articulates above with the descending process of the lacrimal bone, as well as with the edges of the naso-lacrimal groove of the maxilla, thus completing the osseous can
. Cunningham's Text-book of anatomy. Anatomy. THE LACEIMAL BOXES. 143 it articulates with the inferior conchal crests on the medial surface of the body of the maxilla and the perpendicular part of the palate bone respectively. Be- tween these two articulations the central part of the superior border rises in the form of a sharp crest, the anterior part of which forms the upstanding processus lacrimalis (lacrimal process) which articulates above with the descending process of the lacrimal bone, as well as with the edges of the naso-lacrimal groove of the maxilla, thus completing the osseous canal of the naso-lacrimal duct. The posterior end of this crest is elevated in the form of an irregular projection called the processus ethmoidalis (ethmoidal process). This unites with the uncinate process of the ethmoid bone (see Fig. 150). Spreading downwards from the middle of the superior border, on its lateral side, is a thin irregular plate of bone, the processus maxillaris (maxillary process), which partially conceals the lateral concave surface of the bone, and, by its union with the medial wall of the maxillary sinus, assists in the com- pletion of the partition which separates that cavity from the inferior nasal meatus. The inferior or free border, gently curved from before backwards and slightly out-turned, is rounded and full, and formed of bone which is deeply pitted° and of a somewhat cellular character. The anterior and posterior extremities of the bone, formed by the convergence of the superior and inferior borders, are thin and sharp; as a rule the posterior end is the more pointed of the two. The medial surface projects into the nasal cavity; convex from above downwards, and slightly curved from before backwards, it forms the floor of the middle meatus. It is rough and pitted, and displays some scattered and longitudinally directed vascular grooves. The lateral surface overhangs the inferior meatus of the nose. Concave from above downwards, and to some extent
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
