524 



THE MUSCLES AND FASCIA 



4. The Posterior Femoral Region. 



(Hamstring Muscles.} 

 Biceps femoris. Semitendinosus. Semimembranosus. 



Dissection (Fig. 386). Make a vertical incision along the middle of the back of the thigh, 

 from the lower fold of the buttock to about three inches below the back of the knee-joint, and 

 there connect it with a transverse incision, carried from the inner to the outer side of the leg. 

 Make a third incision transversely at the junction of the middle with the lower third of the 

 thigh. The integument having been removed from the back of the knee, and the boundaries 

 of the popliteal space having been examined, the removal of the integument from the remaining 

 part of the thigh should be continued, when the fascia and muscles of this region will be exposed. 



GLUTEUS MAXIMUS 



GLUTEUS MAXIMUS 



SEMIMEMBRANOSUS 



ADDUCTOR LONGU8 

 ADDUCTOR MAGNUS M 



GUUTEU6 MEDIU8 



GLUTEUS MAXIMUS 

 ADDUCTOR MAGNUS 



VASTU8 EXTERNU8 



SHORT HEAD OF 

 BICEPS 



INNER HEAD OF 

 GASTROCNEMIU8 



SEMIMEMBRANOSUS 



PLANTARIS 

 OUTER HEAD OF 

 GASTROCNEMIUS 

 'POPLITEUS 



' 

 POPLITEUS 



FIG. 390. Diagram showing the attachments of the muscles of the thigh. Posterior aspect. 

 Origins, red; insertions, blue. 



The Biceps femoris (m. biceps femoris') is a large muscle, of considerable 

 length, situated on the posterior and outer aspect of the thigh (Figs. 387 and 391). 

 It arises by two heads. One, the long head (caput loiigum'), arises from the lower 

 and inner impression on the back part of the tuberosity of the jschium, by a tendon 



