ANATOMY IN A NUTSHELL. 



93 



The dorsalis indicis arises from the radial just before it passes between the 

 two heads of the Abductor indicis; it then passes over the dorsum of this mus- 

 cle, which it supplies, to the radial side of the index finger. At the first inter- 

 phalangeal joint it anastomoses with the posterior branch of the radialis in- 

 dicis. 



PLATK XXXIV 



THIRD DORSAL INTEROSSEOUS lill-fij SECOND DORSAL INTEROSSEOUS 



FIRST DORSAL INTEROSSEOUS 



FOURTH DORSAL INTEROSSEOUS 



The Four Dorsal Enterossej 



The deep palmar arch is formed by the radial, after it pusses between the 

 two heads of the Abductor indicis, and a terminal branch of the ulnar. This 

 arch has its convexity distally; it lies upon the bases of the metacarpal bones. 

 It has five branches, four from the convexity and one from the concavity. 



The princeps polllcis first passes between the Abductor indicis and the 



