64 HANDBOOK OF ANATOMY 



synovialis patellaris. In addition it forms at the patellar end 

 wing-like expansions the plica alares - which are usually loaded 

 with fat. 



MUSCLES ACTING ON THE JOINT. 



Action. 



Flexion 



Exten- 

 sion 



Muscle. 



Hamstrin 

 Biceps 



Semi- 

 membran- 



Semiten- 

 dinosus 



Sartorius 

 Gracilis 



Gastroc- 

 nemius 



Plaritaris 



Popliteus 



Quadr 



Rectus 

 femoris 



Vastus 

 externus 



Origin. 



gs, consisting of 



See Hip-Joint 



By two heads (1) On 

 the upper part of the 

 external condyle and 

 supracoridyloid ridge ; 

 (2) from the space 

 between the internal 

 condyle and the ad- 

 ductor tubercle 



From the lower third of 

 the outer supracondy- 

 loid ridge 



By a tendon from the 

 outer surface of the 

 external condyle 



oeps extensor, consisting 



The straight head from 

 the anterior inferior 

 spine of the ilium and 

 the reflected head 

 from a groove just 

 above the acetabulum 



From the anterior sur- 

 face of the shaft of 

 the femur in front of 

 the great trochanter 

 round to the outer lip 

 of the linea aspera and 

 its upper half ; deep 

 fascia 



Insertion. 



Nerve-supply. 



The tendo Achillis in- 

 serted in the middle 

 part of the posterior 

 surface of the os calcis 



The tendo Achillis, or a 

 separate insertion on 

 its inner side 



The triangular surface 

 on the upper part of 

 the posterior surface 

 of the tibia above the 

 oblique line 



of four parts 



The upper border of 

 the patella and the 

 ligamentum patella? 



The upper and outer 

 border of the patella 

 and the ligamentum 

 patellae 



Tibial 



Tibial 



Tibial 



Anterior 

 crural 



Anterior 

 crural 



