THE POSTERIOR TIBIOFIBVLAR REGION 



531 



INNER HEAD OF 

 GASTROCNEMIU8 



SEMIMEM8RANOSUS 



GASTROCNEMIUS 

 AND SOLEUS 



(Tendo Achillis) 



OUTER HEAD OF 

 GASTROCNEMIU8 

 POPLITEUS 



FLEXOR LONQU8 



MALLUCIS 



PERONEUS BREVI8 



Fi<;. 394. Diagram showing the attachments of muscles of leg. Posterior aspect. Origins, red; insertions 

 blue. The attachments of muscles of bones of foot are given in detail in Figs. 191 and 192. 



separated by a synovial bursa, which, in some cases, commu- 

 nicates with the cavity of the knee-joint. The tendon of the 

 outer head contains a sesamoid fibrocartilage (rarely osseous), 

 where it plays over the corresponding outer condyle; and 

 one is occasionally in the tendon of the inner head. 



The Gastrocnemius should be divided across, just below 

 its origin, and turned downward, in order to expose the next 

 two muscles. 



The Soleus (m. soleus] is a broad flat muscle 

 situated immediately beneath the Gastrocnemius. It 

 has received its name from its resemblance in shape 

 to a sole-fish. It arises by tendinous fibres from the 

 back part of the head of the fibula and from the up- 

 per third of the posterior .surface of its shaft; from 

 the oblique line of the tibia and from the middle 

 third of its internal border; some fibres also arise 

 from a tendinous arch placed between the tibial and 

 fibular origins of the muscle, beneath which the 

 popliteal vessels and internal popliteal nerve pass. The fibres pass backward 

 to an aponeurosis which covers the posterior surface of the muscle, and this, 



BURSA BETWEEN 

 FASCIA AND 



BURSA BETWEEN 

 TENDON AND 

 OS CALCIS 



FIG. 39.5. Bursae of the tendo 

 Achillis. (Poirier and Charpy.) 



