826 



HUMAN ANATOMY 



the fibres of which run obliquely outward instead of inward. The sartorius is 

 displaced inward and the thigh more strongly abducted, when the tension on the 

 adductor fibres — the adductor magnus and the lower edge of the adductor longus — 

 will clearly define the lower — inner — border of Hunter's canal. The aponeurotic roof 



of the canal stretch- 



FlG. 



/o' 



Rectus muscle 

 Nerve to vastus 



internus 



Sartorius muscle 



Vastus internus 



muscle 



Adductor longus muscle 

 Femoral vein 

 Internal cutaneous nerve 

 ■^—Internal saphenous nerve 

 Femoral artery 



Roof of Hunter's canal 

 Internal saphenous vein 



Dissection showing- femoral vessels in Scarpa's triangle 

 and disappearing in Hunter s canal. 



ing across to the 

 vastus internus is 

 pierced by the in- 

 ternal saphenous 

 nerve, which may be 

 a useful guide. This 

 aponeurosis is di- 

 vided and the vessel 

 exposed. The vein 

 lies behind and 

 somewhat to the 

 outer side. The 

 needle should be 

 passed from without 

 inward. 



The collateral 

 circulation after liga- 



tion of the superficial 

 femoral is carried on 

 from above by (a) 

 the perforating and 

 terminal branches of 

 the profunda ; and 

 {b) the descending 

 branch of the exter- 

 nal circumflex anas- 

 tomosing respectively with (a) the superior articular and muscular branches of the 

 popliteal ; and {b) the anastomotica magna and superior articular from below. 



1. The Superficial Epigastric Artery. — The superficial epigastric artery 

 (a. epigastrica superticialis) (Fig. 729) arises from the anterior surface of the femoral, 

 about I cm. below Poupart's ligament. It is directed at first forward, but, after per- 

 forating the fascia lata or sometimes the cribriform fascia, it bends upward over 

 Poupart's ligament and ascends between the superficial and deep layers of the super- 

 ficial abdominal fascia to the neighborhood of the umbilicus. It gives branches to 

 adjacent inguinal lymphatic nodes and to the integument, anastomosing with the 

 cutaneous branches of the deep epigastric artery. 



2. The Superficial Circumflex Iliac Artery. — The superficial circumflex 

 iliac artery (a. circumtlexa ilium superticialis) (Fig. 729) arises from the anterior surface 

 of the femoral, a little below the superficial epigastric, or from a common trunk with 

 that artery. It perforates the fascia lata or the cribriform fascia and is then directed 

 laterally more or less parallel with Poupart's ligament, extending almost as far as the 

 anterior superior spine of the ilium. It gives branches to the adjacent inguinal lym- 

 phatic nodes and to the sartorius muscle, and anastomoses with the cutaneous 

 branches of the deep circumflex iliac. 



3. The Superficial External Pudic Artery. — The superficial external pudic 

 artery (a. pudenda e.vterna superticialis) (Fig. 729) arises from the inner surface of the 

 femoral artery and is directed inward and slightly upward towards the spine of the 

 pubis. It pierces the cribriform fascia and, crossing over the spermatic cord or round 

 ligament, sends branches tf) the integument above the pubes. It is then continued 

 along the dorsal surface of the penis or clitoris, lateral and external to the dorsal artery 

 of that organ, with which it anastomoses at the glans. It supplies branches to the 

 integument of the penis and to the preputium clitoridis, and also gives branches 

 to the scrotum or labium majus. 



