104 LABORATORY MANUAL OF HUMAN ANATOMY 



(ac) A. metacarpea volaris III. (0. T. second palmar interosseous), 



forward between third and fourth phalanges to join A. 

 digitalis communis. 



(ad) A. metacarpea volaris IV. (0. T. third palmar interosseous), 



forward between fourth and fifth phalanges to join A. 

 digitalis communis. 



Note rami perforantes given off by each volar metacarpal 

 artery. 



Study the formation of the volar carpal network (rete carpi 

 volar e) (O. T. anterior carpal rete). 



DORSAL SURFACE AND RADIAL MARGIN OF FORE- 

 ARM (FACIES DORSALIS ET MARGO RADIALIS 

 ANTIBRACHII). 



The skin and superficial fascia with their nerves and blood- 

 vessels have already been studied. The fat of the superficial 

 fascia should now be completely removed and the deep fascia 

 studied. 



Dorsal Portion of Deep Fascia of Forearm (Fascia antibrachii) . 



How is it attached above and below ! Note the relation of its 

 deep surface to the extensor muscles. The dorsal ligament of 

 the carpus (lig amentum carpi dor sale) (0. T. posterior annular 

 ligament) is really a part of it. 



Superficial Muscles of Dorsum of Forearm. 



Dissect away the deep fascia on the dorsum of the forearm, 

 with the exception of that portion of it near the elbow overlying 

 and giving origin to muscles underneath. The ligamentum carpi 

 dorsale should also be preserved. Isolate as far as possible and 

 clean the surfaces of the following muscles : 



(a) Brachioradial muscle (M. brachioradialis) (0. T. supinator longus). 



(b) Long radial extensor muscle of carpus (M. extensor carpi radialis 



longus). 



(c) Short radial extensor muscle of carpus (M. extensor carpi radialis 



b rev is). 



(ca) Bursa M. extensoris carpi radialis brevis (Spalteholz, Fig. 

 360). 



(d) Common extensor muscle of fingers (M. extensor digitorum com- 



munis ) . 



Study juncturae tendinum later. 



(e) Proper extensor muscle of fifth finger (M. extensor digiti quinti 



proprius) (0. T. extensor minimi digiti). 



