PLATE XIX. 

 SCARPA'S TRIANGLE. 



This plate shows a superficial dissection of the front of the thigh, the fascia lata 

 and the sheath of the femoral vessels having been removed. If the line of Poupart's 

 ligament be compared with that in Plate XVIII., it will be noticed that the ligament is 

 bowed down towards the thigh when the fascia lata is intact ; but when this is removed 

 the line of the ligament becomes nearly straight, retracting sufficiently to allow the 

 origin of the deep epigastric or circumflex iliac from the external iliac artery to be seen. 



Scarpa's Triangle. This triangle is situated in the front of the thigh, with the base 

 upwards and apex downwards. Its boundaries are : 



Base : Poupart's ligament. 



Inside : Inner edge of the adductor longus. 



Outside : Inner edge of the sartorius. 



Floor is formed from within outwards by the adductor longus, pectineus, psoas, and 

 iliacus muscles. Sometimes the adductor brovh is seen between the 

 adductor longus and pectineus : this chiefly occurs in thin and weak 

 subjects. 



Contents : It contains the common, superficial, and deep femoral arteries and veins 

 and their branches ; the anterior crural nerve with its branches ; the 

 crural branch of the genito-crural nerve and the external cutaneous nerve, 



The nerve to the sartorius is usually bound up with the middle cutaneous nerve, 

 hut it may occasionally run with the internal cutaneous. In the dissection represented 

 the nerve came off direct from the anterior crural above Poupart's ligament. The 

 genito-crural nerve is not uncommonly united with the middle cutaneous branch of tha 

 anterior crural before piercing the fascia, (ftlacalister.) 



