. Cunningham's Text-book of anatomy. Anatomy. THE NASAL BONES. 145 fuse at their lower edges, and by forward growth invade the posterior end of each anterior paraseptal cartilage, thus forming a deep groove in which the septal cartilage is lodged (Fawcett). As growth goes on the groove becomes reduced by the further fusion of the lateral plates and the absorption of the cartilage, until the age of puberty, by which time the lateral laminae have united to form a median plate, the primitively divided condition of which is now only represented by the eversion of the alee and the grooving along th
. Cunningham's Text-book of anatomy. Anatomy. THE NASAL BONES. 145 fuse at their lower edges, and by forward growth invade the posterior end of each anterior paraseptal cartilage, thus forming a deep groove in which the septal cartilage is lodged (Fawcett). As growth goes on the groove becomes reduced by the further fusion of the lateral plates and the absorption of the cartilage, until the age of puberty, by which time the lateral laminae have united to form a median plate, the primitively divided condition of which is now only represented by the eversion of the alee and the grooving along the anterior border. According to Fawcett, the ossification of the Jacobsonian cartilage produces a hitherto undescribed element in the formation of the osseous nasal septum. Ossa Nasalia. The nasal bones, two in number, lie in the interval between the frontal processes of the maxillae, there forming the root or bridge of the nose. Each bone is of elongated quadrangular form, having two surfaces—an inner ^aer Frontai and outer—and four borders. The ft^Si ^r^ir outer surface, somewhat constricted about its middle, is convex from side to side, and slightly concavo-convex from above downwards. Near its centre there is usually the opening of a nutrient canal. The inner surface is not so ex- tensive as the outer, as the superior and anterior articular borders encroach somewhat upon it above. Concave n *j a -j ji c -U FlG- 156.—The Right Nasal Bone. from side to side, and also from above A> Lateral side . Bi Medial side. downwards, it is covered, in the recent condition, by the mucous membrane of the nose. Eunning downwards along this surface is a narrow groove (sulcus ethmoidalis) which transmits the anterior terminal branch of the naso-ciliary nerve. The anterior or medial border, narrow below, is thick above, and, in conjunction with its fellow at the opposite side, with which it articulates, forms a median crest posteriorly, which is united to the spine of the frontal, the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
