THE HAMSTRING MOSCLE8. 



131 



i 



The BICEPS (tig. 53, D) 

 lias two heads of origin, 

 ln- and short, which are 

 attached to the pelvis and 

 the femur. The long head 

 from the lower and 

 inner impression oil the 

 ischial tuberosity, in com- 

 mon with the semitendi- 

 nosus muscle (fig. 47, 

 p. 113). The short head 

 arises from the femur 

 below the glutens maxi- 

 mus ; from the outer lip of 

 the linea aspera, from the 

 upper three-fourths of the 

 line leading to the outer 

 condyle, as well as from 

 the external intermuscular 

 M-ptum (fig. 61, p. 158). 

 The fibres end below in a 

 iriidon, which is inserted 

 into the head of the fibula 

 embracing the external 

 lateral ligament (fig. 68, 

 p. 179); and a slight 

 piece is prolonged to the 

 head of the tibia. 



The muscle is super- 

 ficial except at its origin, 

 where it is covered by the 

 glutens maximus ; it rests 

 on the upper end of the 

 seinimembranosus, on the 



FIG. 53. DISSECTION UF THE BACK OF THE THIGH (ILLUSTRATIONS 

 OP DISSECTIONS). 



Biceps 

 arises by 

 a long 



and a sliurt 

 heart ; 



7 is inserted 

 into the 

 fibula and 

 tibia ; 



relations 



Muscles : 



A. Gluteus maximus, 

 cut below, and partly 

 raised. 



B. Quadratic femoris. 

 c. Adductor magnus. 



D. Biceps. 



E. Semitendino.su.s. 



F. Semimembranosus. 



G. Outer, and H, inner 

 head of the gastro- 

 cnemius. 



Vessels : 



a. Sciatic artery. 



b. Ending of internal 



circumflex to hamstrings. 



c. First, d, second, 

 and e, third perforating 

 arteries. 



/. Muscular branch of 

 profuuda. 



g. Popliteal artery. 



h. Popliteal vein. 



i. Short saphenous 

 vein. 



k. Upper external, 

 and 7, upper internal 

 articular artery. 



Serves : 

 1. Small sciatic, cut. 



2. Large sciatic. 



3. Branch to ham- 

 strings from large 

 sciatic. 



4. External popliteal. 



5. Communicating 

 peroneal. 



7. Articular branch 

 of obturator to knee. 



8. Internal popliteal. 



9. Articular branch 

 to knee of the internal 

 popliteal. 



10. Tibial communi- 

 cating. 



K 2 



