EXTKEMlTiES. 63 



Digital. — (See the anterior extremity, page 33). 



Veios* — Tiie subuno^ueal network from wliicli rises 

 tlie two digital veins. To these succeed three meta- 

 tarsal veins, common origin of all the veins of the leg. 

 These are divided into superficial and deep ; two su- 

 j)erficial — the saphena, and two deep — the tibial. All 

 empty in the popliteal, which is continued by the 

 femoral, and this by the external iliac, which re- 

 ceives only one important vein, viz. — the circumflex 

 iliac. The external iliac vein uniting with the internal 

 iliac form the primitive iliac or pelvi-crural trunk, 

 which empties into the posterior vena cava. 



Lymphatics. — They all converge towards the sub- 

 lumbar ganglions and present in their extent other 

 ganglionary masses constituting the deep and super- 

 ficial ingunial, popliteal, iliac, and precrural ganglions, 

 to each of which afferent lymphatic vessels arrive, and 

 from which efferent vessels are given off. 



NEUROLOGY. 



Lumbar Plexus.— Formed by the two last lumbar 

 and three first sacral pairs of nerves, is divided into 

 anterior and posterior portions. The first is concealed 

 by the small psoas muscle, and lies in front of the 

 internal iliac artery. The posterior, on a level with 

 the great sciatic notch, is in connection inwards with 



