DEVELOPMENT OF THE ARTERIES. 



849 



the external iliac a vessel {saph) which accompanies the internal saphenous nerve down the 

 leg and, entering the foot, takes from the original main stem its digital branches {B). From this 

 saphenous artery a branch is given off which pierces the substance of the adductor magnus mus- 



FiG. 747. 



/^ 



Diagrams illustrating development of arteries of upper limb ; b, brachial ; /, interosseous ; 

 d, digital ; m, median; «, ulnar; sb, superficial brachial ; r, radial. 



/- 



/^ 



saph 



Fig. 748. 

 c 



D 



per 



d d d d 



Diagrams illustrating development of arteries of lower limb ; s, sciatic ; rf, digital ; f, femoral ; 

 saph, saphenous ; pop, popliteal ; per, peroneal ; pt, at, posterior and anterior tibial. 



cle and anastomoses with the sciatic artery just above the upper end of the popliteal space (0> 

 whereupon the portion of the sciatic artery immediately above the anastomosis degenerates and 



54 



