ANATOMY IN A NUTSHELL. 



107 



The scaphoid ossifies the sixth year. It articulates with five bones, viz.. 

 radius proximally. trapezium and trapezoid distallv. and os magnum and semi- 

 lunar internally. It has one muscle attached, the Abductor pollicis. The 

 blood supply of the carpal bones is the anterior and posterior carpal arch, and 

 a large branch from the anterior interosseous, and small branches from the pos- 

 terior interosseous. 



The semilunar ossifies the fourth year. It articulates with five bones, viz.. 

 radius proximally. os magnum and unciform distallv. scaphoid and cuneiform 



CAPSULAR LIGAMENT 



INT. LATERAL LISA! -1ENT \\\ X .-X P0 \]^2i^ A *l 1 '^\ It',' 



POST. RADIO-ULNAR LIGAMENT 



EXT. LATERAL LIGAMENT. 



Tin: Wrist-Joint — Posterior View 



on either side. It has no muscle attached. The blood supply i- the same as 

 the carpus. 



The cuneiform ossifies the third year. It articulates with three bone-. 

 viz., semilunar externally, pisiform in front, and unciform distally, and with 

 the triangular interarticular fibro-cartilage which separates it from the distal 

 end of the ulna. There are no muscles attached to this bone. 



The pisiform ossifies the twelfth year. It articulates with one bone, the 

 cuneiform. It has two muscles attached. Flexor carpi ulnaris and Abductor 

 minimi diuiti. 



