'////; i. ruin >-s.\< -KM. n;r\K 



plied by I lie superficial branch. Tlic branch to the obturator cxternus is given off in 

 1 he obturator canal. 



1'. An articular branch to the knee-joint which ap|>ears in some cases to be 

 the continuation of the trunk of the |x>stcrior branch dig. <)!()). It eithe- 

 the lower part of the adductor magnus, or it passes through the opening for the 

 femoral artery. In the popliteal ,~pa''e it descends on the popliteal artery to the 

 back of the joint, where it pierces || U . posterior li.irament. and its terminal iilaments 

 are distributed to the crucial ligaments and the structures in their immediate neigh- 

 bourhood. This branch is not uncommonly absent. Occasionally the posterior 

 branch of the obturator nerve also supplies a twig to the hip-joint. 



The Accessory Obturator Nerve arises from the third or fourth or from the third 

 and fourth lumbar nerves, in the angles between the roots of the femoral (anterior 

 crural) and obturator nerves. It is present in about ten per cent, of the cases 

 examined. It h often closely associated with the obturator nerve to the level of t he 



Fio. 691. DISTRIBUTION OF CUTANEOTS NEHVES ON THE POSTERIOR AND ANTERIOR 

 ASPECTS OF THE INFEKIOK EXTREMITY. 



I i TERAL 

 Cl'TASl "I x 



SURAL 



,IM. 



MIHIII.I-: 



( I.I'MAL 



IKFERIOS 

 MEDIAL 



i li \/.l/, 

 LONG 



HIK \'v/;\v or 



I'n* 1 rtnnK 

 i'!T.( \, 

 OBTCRATOR 



A.\Ti:/!/OK 



VEOUS 



MRni.it. srmr. 



ILIO- 



INGllS.lL 



ANTERIOR 

 CUTANEOUS 



\KTERIOR 



</\ //:/. ,\ li,)' 

 VVTAXEUl'S 



/.v/v: i- 



PATKI.I.Ul 



1:1; i\r/i 

 nr >.i I'll i. - 



irovs 



SAPBENOVS 



Tir/ilfi FROM 



tTEDTAL 



-I/ -I \r i/. 

 BRANCHES 



ill-' T1KIAL 



T>EEP 

 PEROXKA /, 



SUPER 



I '/' IM, 

 ri:i:n.\KAl. 



I.ATEKM. 

 /'"/.'.-, l /. 

 CUTANKOV6 



brim of the pelvis, but instead of passing through the obturator foramen, it descends 

 along the inner border of the psoas. crosses t he anterior part of t he brim of the pelvis, 

 passes beneath the pectineus, and terminates in three main brandies. One of these 

 branches joins the anterior division of the obturator nerve, another supplies the 

 pectineus, and the third is distributed to the hip- joint. 



THK I.rMni>--\( KM, TRTXK 



The trunk usually formed by the union of the smaller part of the fourth and the 

 entire fifth lumbar nerves is called the lumbo-sacral trunk (figs. (iss. (WH). Some- 

 times the larger part of the fourth nerve may help to form the trunk. It may re- 



