646 



MAMMALIAN ANATOMY 



The lateral and medial surfaces are triangular ; the base of the 

 triangle is the dorsal border, and the apex is at the proximal ventral 

 end. The lateral surface is gently convex. The medial surface is 

 smaller than the lateral surface, and somewhat excavated for the at- 

 tachment of the transverse ligaments. A small, triangular, flattened 

 surface at the disto-lateral angle affords attachment to ligaments which 

 bind the bone to the palmar end of the base of the phalanx. 



FIG. 510. 



EXTENSOR OSSIS METACARPI POLLICIS. 

 EXTENSOR CARPI RADIALIS BREVIOR. 



EXTENSOR CARPI RADIALIS LONGIOR. 



FIRST DORSAL INTEROSSEOUS. 

 ABDUCTOR POLLICIS. 



EXTENSOR INDICIS. 



FIRST LUMBRICAL. 



SECOND LUMBRICAL. 



THIRD LUMBRICAL.- - 

 EXTENSOR INDICIS. "> 



EXTENSOR COMMUNIS DIGITORUM. >'- 

 EXTENSOR MINIMI DIGITI. J 



EXTENSOR COMMUNIS DIGITORUM. \- - 

 EXTENSOR MINIMI DIGITI. J 



-.EXTENSOR CARPI ULNARIS. 



SECOND DORSAL INTEROSSEOUS. 

 THIRD DORSAL INTEROSSEOUS. 

 FOURTH DORSAL INTEROSSEOUS. 



--ABDUCTOR MINIMI DIGITI. 



- -1-- -"FOURTH LUMBRICAL. 



/ EXTENSOR COMMUNIS DIGITORUM. 

 I EXTENSOR MINIMI DIGITI. 



f EXTENSOR COMMUNIS DIGITORUM. 

 (EXTENSOR MINIMI DIGITI. 



MUSCLES ATTACHED TO THE HAND. DORSAL ASPECT. 



MUSCULAR ATTACHMENTS ON THE HAND. 

 MUSCLES ATTACHED TO THE CARPUS. 



On the Pisiform, the insertion of the flexor carpi ulnaris, the origin 

 of the abductor minimi digiti. 



On the Trapezium and Trapezoid, the origin of the flexor brevis 

 pollicis. 



On the Magnum, part of the origin of the adductor pollicis. 



