KNEE JOINT 



409 



by a bursa which communicates round the medial border of 

 the gastrocnemius with the bursa between the medial head 

 of the gastrocnemius and the semimembranosus, and it may 

 communicate with the cavity of the joint, through an aperture 

 in the capsule. The medial and lateral parts of the 

 posterior portion of the capsule, which are covered by 



Tendon of adductor, 

 magnus muscle (cut) 



M. gastrocnemius 

 medial head (cut) 

 Oblique popliteal 

 ligament 



Bursa beneath tendon 

 of semimembranosus 



Tendon of semimem 

 branosus muscle (cu 



Oblique popliteal liga- 

 ment 



'1 ibial collateral, 

 ligament 



Popliteal fascia 

 M. popliteus (cut 



Popliteal surface of femur 



M. plantaris (cut) 



M. gastro- 

 cnemius 

 lateral head 

 (cut) 



Fibular collateral 



ligament 



Fibular collateral 



ligament 

 M. popliteus 

 (cut) 



M. biceps 

 femoris (cut) 



Head of fibula 



Popliteal surface of tibia 



FIG. 1 80. The Knee Joint. Posterior view. 



the heads of the gastrocnemius, are thin, but the intermediate 

 portion, which forms part of the anterior boundary of the 

 popliteal fossa, is strengthened by a strong oblique band, the 

 oblique popliteal ligament, which passes upwards and laterally, 

 from the distal part of the tendon of the semimembranosus 

 to the medial border of the lateral condyle of the femur. 



In addition to the apertures through which the bursa 



