106 



LABORATORY MANUAL OF HUMAN ANATOMY 



DORSUM OF WRIST AND HAND. 

 Radial Artery and Veins. 

 Study- 



(a) Radial artery (A. radialis). 



(aa) Dorsal carpal ramus (ramus car pens dor sails) (0. T. pos- 



terior radial carpal). 



(ab) First dorsal metacarpal artery (A. metacarpea dorsalis I.). 



(aba) Aa. digitales dor sales. 



(1) A. dorsalis pollicis ulnaris. 



(2) A. dorsalis indicis. 



(ac) Dorsal digital artery to radial side of thumb (A. dorsalis 



pol lids ra dia Us). 



FIG. 39. 



Tendon of the M. flexor digitorum sublim 

 Tendon of the M. flexor digitorum profundus 



M. flexor carpi ulnaris - 



A. ulnaris 

 N. ulnaris 



Ramus dorsalis manus 

 of the N. ulnaris 



Discus articularis.- 



Capitulum ulnae 

 Tendon of the 

 M. extensor carpi ulnaris-? 



Lig. carpi volare 



Tendon of the M. palmaris longus 

 N. medianus 



^.Tendon of the M. flexor carpi radialis 

 ^Tendon of the M. flexor pollicis longuc 

 __ .Ramus volaris superficialis 

 _A. radialis 



-.M. abductor pollicis longus 



-M. extensor pollicis brevis 

 -Radius 



M. extensor carpi radialis longus 

 '..M. extensor carpi radialis brevis 

 M. extensor pollicis longus 



Tendon of the M. extensor digiti 

 V. proprius 



Lig. carpi dorsale 



Cross-section of the distal extremity of the right forearm. Surface distal to the cut. 

 (After Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., p. 621, Fig. 999.) 



Tendons of the Mm. extensor digitorum 

 lommunis and extensor indicis proprius 



(ad) Dorsal carpal rete (rete carpi dorsale) (0. T. posterior carpal 



rete). 



(ada) Dorsal metacarpal arteries (Aa. metacarpeae dor- 

 sales II., III., IV.) (0. T. dorsal interosseous 

 arteries). 



Note how each of these divides into two dorsal 

 digital arteries (Aa. digitales dorsales) for adja- 

 cent margins of the second to the fifth finger. 



Find the artery passing directly from the ulnar 

 side of the rete carpi dorsale towards the ulnar 

 margin of the little finger. 

 (b) Radial veins (Vv. radiales). 



Dorsal Ligament of Wrist (Ligamentum carpi dorsale) (O. T. Pos- 

 terior Annular Ligament). 



How does it become attached radialward and ulnarward? 

 How is the space beneath it subdivided ? To what are the various 

 septa attached? Open up the following six compartments and 

 study their contents. 



