DISSECTION OF THE LOWER EXTREMITY 141 



Poupart's ligament. Following this portion of the fascia, fascia 

 pectinea (0. T. pubic portion of fascia lata), lateralward, it will 

 be seen to pass beneath the femoral vessels so as to line the fossa 

 iliopectinea, becoming continuous lateralward with the fascia 

 iliopectinea. The inferior cornu of the falciform margin is now 

 visible. It belongs to that part of the fascia lata which lies 

 lateral from the fossa ovalis, viz., the superficial layer of the 

 fascia lata (0. T. iliac portion of fascia lata), and is inserted 

 medialward into the fascia pectinea or deep layer. Observe the 

 cribriform fascia (fascia cribrosa) closing the aperture of the 

 fossa ovalis. The superficial subinguinal lymph-glands must be 

 removed to display it properly. What vessels pass through this 

 fascia cribrosa? 



Remove the fascia cribrosa carefully, so that the edge of the 

 margo falciformis and its cornu superius may be clearly defined. 

 The upper horn (cornu superius) (0. T. femoral ligament or 

 Key's ligament or ligament of Allan Burns) consists of two 

 layers, an anterior and a posterior. 



The anterior layer of the cornu superius is a broad lamina, strength- 

 ened by Scarpa's fascia; it bounds the fossa ovalis above and lies ver- 

 tically between it and Poupart's ligament, to which it is attached. The 

 posterior, thicker layer of the cornu superius extends further upward 

 than the anterior, passes superficial to the femoral vessels medialward and 

 upward, assumes a horizontal position, filling up the acute angle between 

 the medial end of Poupart's ligament and the pecten ossis pubis, and 

 really forming (by fusion with the process of Poupart's ligament to the 

 pecten) the anterior or inferior part of the ligamentum lacunare [Giin- 

 bernati]. 



The femoral canal will be studied farther on. Beneath the 

 fascia cribrosa within the fossa ovalis observe the deep sub- 

 inguinal lymph-glands (lymphoglandulae subinguinales pro- 



fundae). 



Skin and Superficial Fascia of Anterior Surface of Thigh and Knee. 



Continue the vertical incision on the medial aspect of the 

 thigh distalward as far as the medial condyle of the tibia. Make 

 another incision from the medial condyle of the tibia lateralward 

 across the front of the leg as far as the lateral condyle of the 

 tibia. Eeflect the large flap lateralward, taking no fat with t 

 skin and avoiding injury to nerves and blood-vessels and to tlio 

 subcutaneous praepatellar bursa. 



In the fat of the superficial fascia dissect out carefully 1 

 following structures: 



