. A treatise on practical anatomy: for students of anatomy and surgery . um, and unciform. Each bone is cuboidal in form,and presents six surfaces. The anterior or palmar andthe posterior or dorsal surfaces are rough, and serve forthe attachment of ligaments. Together they form aseries of close articulations, admitting of but littlemovement. Each bone is developed by one centre,except the unciform, which has two,—one for the unci-form process and one for the rest of the bone. Thepisiform is a sesamoid bone developed in the tendon ofthe extensor carpi ulnaris. THE SCAPHOID The scaphoid articula
. A treatise on practical anatomy: for students of anatomy and surgery . um, and unciform. Each bone is cuboidal in form,and presents six surfaces. The anterior or palmar andthe posterior or dorsal surfaces are rough, and serve forthe attachment of ligaments. Together they form aseries of close articulations, admitting of but littlemovement. Each bone is developed by one centre,except the unciform, which has two,—one for the unci-form process and one for the rest of the bone. Thepisiform is a sesamoid bone developed in the tendon ofthe extensor carpi ulnaris. THE SCAPHOID The scaphoid articulates above with the radius, belowwith the trapezium and trapezoid, and internally with thesemilunar and os magnum. The internal surface, smalland tuberculated, gives attachment to the external lateralligaments of the wrist-joint; the dorsal surface entersinto the formation of the dorsum of the wrist; the 120 PRACTICAL ANATOMY. palmar surface, rough and grooved, helps to form theosseous palm. THE SEMILUNAR. The semilunar articulates above with the radius, ex- laearpat. Fig. 56—Carpus, Metacarpus, and Phalanges, Dorsal Surface. ternally with the scaphoid, internally with the cuneiform,inferiorly with the os magnum and unciform. Thepalmar surface is the larger and is rough; the dorsal,rouah for ligramentous attachment. OS MAGNUM. 121 THE CUNEIFORM. The superior surface of the cuneiform is rough andnon-articular; the inferior surface articulates with theunciform; the external surface articulates with the semi-lunar above and the unciform below. The internal sur-face projects and affords attacliment to the externallateral Ugament of the wrist. The dorsal surface isrough for the attachment of ligaments. The anterioror palmar surface presents an articular facet for thepisiform bone. THE PISIFORM. The pisiform, about the size of a large pea, is co-noidal in form; its base presents an articular surface forarticulation with the cuneiform. THE TRAPEZIUM. The trapezium articulates super
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
