ANATOMY IN A NUTSHELL. 



73 



nal surface is convex from the proximal to the distal extremity; it has attached 

 to it the Supinator brevis, and about the center the Pronator radii teres, and 

 distally it is covered by the Extensor carpi radialis longior and Extensor carpi 

 radialis brevior which are crossed by the Extensor ossis metacarpi pollicis and 

 Extensor brevis pollicis. 



The lower extremity is quadilateral. The lower surface which is concave, 

 articulates with the scaphoid and semilunar. The part which articulates with 



PLATE XXVI 



EXTENSOR COMMUNIS DIGITORUM (I) 



EXTENSOR 



MINIMI DIGITI (I), 



(I) EXTENSOR INOICIS. 



EXTENSOR 

 SECUNDI INTFRNODII 

 POLLICIS. 



EXTENSOR 

 CARPI UL:.ARIS. (I) — r\ 



PISIFROM 



il) EXTENSOR 

 PRIMI INTERNOOII 

 POLLICIS. 



1ST METACARPUS. 



EXTENSOR CARPI 

 RADIALIS LONGIOR 

 AND BREVIOR. 



Bones of Left Hand— Posterior View 



the scaphoid is triangular, while that which articulates with the semilunar is 

 quadrilateral. These part- are separated by a ridge. The inner surface is concave 

 and articulates with the head of the ulna. The interarticular fibro-cartilage 

 is attached to the border between the sigmoid cavity and the semilunar sur- 

 faces. 



The perimeter is triangular, having an anterior, external, and posterior 



