316 



M. extensor 

 carpi ulnaris 



Processus 

 styloideus ulnae 



Ligaiiionfum 

 carpi (lorsale 



Muscles of the Arm. 



._ M. extensor pollicis brevis 



- - M. extensor digitorum comnuinis 



Attachment 



of the m. extensor 



carpi ulnaris 



M. abductor 

 digiti V 

 M. extensor 

 digiti V proprius 

 M. extensor 

 digitorum 

 communis 



abductor pollicis longus 

 M. extensor pollicis brevis 



extensor carpi radialis longus 

 M. extensor carpi radialis brevis 



M. extensor pollicis longus 



nterosseus 

 ,lis I 



Junctura 

 tendinura 



Bursa 

 subcutanea 

 digiti dorsalis - 



361. Back of 

 the right hand. 



Ligamentum carpi dor- 

 sale (0. T. posterior annular 

 ligament) (see also Figs. 357 

 til 360) extends as a broad, 

 powerful band of fibers, inter- 

 woven in the fascia antibrachii. 

 I'rom the facies lateralis and 

 tlie proc. styloideus radii obli- 

 (juely distalward to the proc. 

 styloideus ulnae, os triquetrum 

 and OS pisiforme. It is connect- 

 ed by strong processes with the 

 posterior surface of the radius 

 and ulna; in this way six 

 cyliadrieal C(im])artiiieuts are 

 t'urnied fur the tendons of the 

 ' extensor musclt^s. The first 



compartment (numbered from 

 the radial side) is for the nun. abdiu-tor pollicis Lmgus and extensor jHillicis brevis, the second for 

 tlie mm. extensures carpi radiales, the third, ubli(pir|y lirhind the second, for the in. extensor pollicis 

 longus, the fourth for the mm. extensor digitorum commimis and extensor indicis proprius, the 

 fiftb f 'V tl)!' ni. extensor digiti V proprius. tho sixtii for the m. extensor carpi ulnaris. 



