44 LOWER EXTKKMltY. 



uniting with internal iliac to form common iliac. Ori right side, 

 lies to inside of artery at first, but gradually passes behind it. 

 On left side, altogether on inside of artery. Receives epigas* 

 trie and circumflex iliac t No valves. 



Hi'-OlL.er'aa: formed by venae comites of all the branches 

 of the iliac artery, but the umbilical; lies first to inside, but 

 finally gets behind the artery. No valves, though the plexu* 

 that help form it are abundantly supplied. I. H&rttorrhoidal 

 pi, -x us'; t. VesicO'prostatic plex.J 3. vaginal plex.; 4. uterint 

 plex.; 5. dorsalis pent* plex.; these all intercommunicate 

 very freely. 



lliaca COamU'dsS (see iliaca externa); terminates at inter-* 

 Vertebral substance between 4th and 5th lumbar Vertebra, 

 there, with its fellow of opposite side, forms vena cava infe 

 rior. On the right it is the shorter, and nearly vertical. 

 Receives ilio-lumbar. and sometimes lateral sacral veins* 

 Middle sacral empties into left common iliac. No valves* 



NERVES, 



LUM'BAB PLEZ'wS : formed by anterior roots of th* 4 upper 

 lumbar nerves communicating with each other. It furnished 

 diiTcrent nervous branches to supply the inferior extremities, 

 II 0-h7POas'trica \ ist lumbar, outwards to iliac crest, piercing 

 there the transversahs, the iliac branch being distributed to 

 gluterJ integument; the hypogastric supplies the integument 

 in umbilical region. Hio-i guiia'lis: ist lumbar; escapes at 

 external ring, supplying inner thigh, scrotum (labia in female) 

 and inguinal region. Gtett,tO-CUra'.i3 1 zd lumbar and branch 

 from ist, pierces psoas, and near Poupart's ligament divides ; 

 the genital branch to genitals, the crural to integument on 

 anterior upper aspect of \\i.gh\comtnuntcates with midd'.e 

 cutaneous. Cuta'aSH* tlter'nu, : 2d lumbar ; perforates pso:,s, 

 and at Poupart's ligament divides ; the anterior branch sup- 

 plying the anterior and external part of thigh to knee : the 

 posterior, supplying posterior surface of thigh to its middle. 

 Obtura'tor: 3d and 4th lumbar, and at upper part of obturator 

 foramen enters thigh, dividing into: anterior branch supply- 

 ing adductor longus and brevis, pcctincus and femoral artery, 

 giving articular branch to hip-joint ; posterior branch pierces 

 obturator externus, passes to front of adductor magnus, di- 

 viding into muscular branches; articular branch is given off 

 for knee-joint. Obtwa'tOT accesso'lius : either from obturator, or 

 filaments from 3d and 4'.h lumbar; supplies pectincus, hip- 

 joint, and a cutaneous branch to leg. Sometimes wanting. 



