ANATOMY OF THE DRILL. 



435 



from the lateral two-thiixls of the axillary border of the scapula, 

 and some fibres fuse with the proximal part of the dorso-epitro- 

 chlearis. The two humeral heads have extensive areas of origin. 

 The strong tendon of insertion passes to the dorsal aspect of the 

 extremity of the olecranon, but some fibres pass along the side 

 of the tendon to be attached to the proximal inch of the lateral 

 border of the ulna. 



As the hands were not at my disposal, no attempt was made to 

 dissect out the muscles of the forearm. 



The sartorius arises from a narrow area, on the ventral border 

 of the ilium ; and its origin bounds an axch through which the 



Text-ficrure 13. 



Muscles of the tliigli. A.M -. adductor magiius ; A.L : a,dductor longus ; G : gracilis ; 

 S : sartorius ; Q.E : quadriceps extensor attaclied to internal femoral condyle 

 (L.C.F.) and patella (P.) ; A.C.N., E.C.N., G.S.N : anterior crural, external 

 cutaneous and great sciatic nerves. 



lateral cutaneous nerve of the thigh emerges. It is inserted into 

 the front of the shaft of the tibia distal to the insertion of the 

 qua.driceps extensor. To reach that point it describes a curve 

 like the italic /*. It helps to bound three triangles — a deep 

 Scarpa's Triangle whose boundaries areas in Man, a triangle whose 

 other boundaries are the adductor longus and gracilis, and a tri- 

 angle whose other boundaries are the quadriceps tendon and 

 internal femoi'al condyle. In the latter triangle the tendon of 

 the adductor magnus is seen passing the internal condyle to reach 

 the tibia (text-fig. 13). 



