. Cunningham's Text-book of anatomy. Anatomy. 218 OSTEOLOGY. os capitatum Lesser multangular Navicular Abductor pollicis brevis \ Greater multangular Opponens POLLICIS Abductor pollicis Flexor carpi radialis Oa lunatum Os HAMATUM Os triquetrum tys Flexor carpi ulnaris Pisiform Abductor digiti quinti Flexor digiti quinti BREVIS Flexor carpi ulnaris Opponens digiti quinti Adductor f Oblique head pollicis \ Transverse head. Fig. 210.—Volar Aspect of Bootes of the Right Carpus and metacarpus with muscular attachments mapped out. os hamatum ( unciform). Irregularly six-sided, each of th
. Cunningham's Text-book of anatomy. Anatomy. 218 OSTEOLOGY. os capitatum Lesser multangular Navicular Abductor pollicis brevis \ Greater multangular Opponens POLLICIS Abductor pollicis Flexor carpi radialis Oa lunatum Os HAMATUM Os triquetrum tys Flexor carpi ulnaris Pisiform Abductor digiti quinti Flexor digiti quinti BREVIS Flexor carpi ulnaris Opponens digiti quinti Adductor f Oblique head pollicis \ Transverse head. Fig. 210.—Volar Aspect of Bootes of the Right Carpus and metacarpus with muscular attachments mapped out. os hamatum ( unciform). Irregularly six-sided, each of these bones possesses non-articular volar and dorsal surfaces. In addition, the marginal bones are non- articular alono- their ulnar and radial aspects according as they form the medial or lateral members of the series. Navicular Bone ( Scaphoid).—This is the largest as well as the most lateral bone of the first row. Its volar surface, rough for the attach- ment of ligaments, is irregularly triangu- lar. The distal angle on the lateral side forms a projec- tion called the tuber- osity; this can be felt at the base of the root of the thumb. Its proximal surface is convex from side to side and before backwards for articula- tion with the radius. This area extends considerably over the dorsal surface of the bone. Its distal surface is convex from before backwards, and ex- tends on to the dorsal aspect of the bone, slightly convex from side to side; it is divisible into two areas, the lateral for articulation with the greater multangular, the medial for the lesser multangular. The lateral surface is narrow and rounded and forms a non-articular border, which extends from the radial articular surface proximally to the tuberosity distally. The medial surface is hollowed out in front for articulation with the head of the capitate bone. Proximal to this it displays a small semilunar- shaped facet for the os lunatum. The dorsal non - articular surface lies between the lateral artic
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