. Anatomy, descriptive and applied. Anatomy. For scaphoid For unciform For os magnum A B Fig. 154.—The left semilunar. A, anterior and internal surfaces; B, external surface. Surfaces.—The superior surface, convex, smooth, and bounded by four edges, articulates with the radius. The inferior surface is deeply concave, and of greater extent from before backward than transver,sely; it articulates with the head of the OS magnum and by a long, narrow facet (separated by a ridge from the general surface) with the unciform bonc^^fhe anterior or palmar and posterior or dorsal surfaces are rough, for t
. Anatomy, descriptive and applied. Anatomy. For scaphoid For unciform For os magnum A B Fig. 154.—The left semilunar. A, anterior and internal surfaces; B, external surface. Surfaces.—The superior surface, convex, smooth, and bounded by four edges, articulates with the radius. The inferior surface is deeply concave, and of greater extent from before backward than transver,sely; it articulates with the head of the OS magnum and by a long, narrow facet (separated by a ridge from the general surface) with the unciform bonc^^fhe anterior or palmar and posterior or dorsal surfaces are rough, for the attachment of ligaments, the former being the broader and of a somewhat rounded form. The external surface presertts a narrow, flat- tened, semilunar facet for articulation with the scaphoid. The internal surface js marked by a smooth, quadrilateral facet, for articulation with the cuneiform. To ascertain to which hand this bone belongs, hold it with the dorsal surface upward, and the convex articular surface backward; the quadrilateral articular facet will then point to the side to which the bone belongs. Articulations.—With five bones—the radius above, os magnum and unciform below, sca])hoid externally, and cuneiform internally. For pisifor. The cuneiform (os ) (Fig. 155) may be distinguished by its pyramidal shape, and by 'its having an oval, isolated facet for articulation with the pisiform bone. It is situated at the upper and inner side of the carpus. Surfaces.—^The superior surface presents an internal, i'ough, nonarticular portion, and an external or articular portion, which is convex, smooth, and articu- lates with the triangular intra-articular fibrocartilage of the wrist. The inferior surface, directed outward, is concave, sinuously curved, and smooth for articulation with the unciform. The posterior or dorsal surface is For unciform Fig. 155.—The left Please note that these images are extracted from scanned page images that may
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
