348 



Muscles of the Leg. 



Tendo m. 



adductoris 



iiiagni 



M. semimem- 

 branosus 

 (dran aside) 



Bursa m. semi 

 membranosi 



Planum 

 popliteum 



i'enioris 

 M. biceps 

 (drawn aside) 



B. bicipito- 

 gastrocnemialis 

 M. plantaris 



gastrocnemius 



soleu> 



393. Muscles of the 

 right leg, 



viewed from beliind. 



M. ti'iceps surae, consists of two 

 muscles, m. gaslrocnemins and m. 

 soleus , which are separated at their 

 < irigins, but are inserted by means of 

 a common tendon, lendo calcaneus 

 [Achillia], into the posterior surface 

 of the tuber calcanei (b. tendinis cal- 

 canei [AcliiUisj see Fig. 395). 



M. gastrocnemius (see also Tigs. 

 258,384,388391). Form: flat, long, 

 with two heads . Position: superficial 

 on the back of the leg; it forms the 

 main mass of the calf. Origin: tendi- 

 nous, from the planum popliteum fe- 

 moris, fused with the capsule of the 

 joint: caput laterale: above thecondy- 

 lus lateralis (b. m. (jastrocnemii Catc- 

 ralis see Fig. 395) ; it frequently con- 

 tains a small sesamoid cartilage-; caput 

 mediate: above the condylus medialis 

 (b. m. (jastrocnemii medialis see Fig. 

 394). Insertion: fibers for each 

 head arise also fi'om a tendinous strip 

 lying on the surface; they diverge 

 below to form a broad tendon, which 

 begins high up on the anterior surface 

 of the muscle, becomes narrower and 

 thicker below and goes over into the 

 tendo calcaneus; the two heads con- 

 verge, from their origins on. downward 

 and are separated below only by a 

 narrow groove: the belly of tlie medial 

 head extends somewhat farther distal- 

 ward. Action: it flexes the foot 

 plantarward and supinates it. Inner- 

 vation: n. tibialis. 



Bursa m. semimembrauosi. 

 constant, double: one between the m. 

 semimembranosus and caput mediale 

 m. gastrocnemii, in front coming in 

 contact with the capsule of the joint 

 (it very frequently comnmnicates with 

 the joint cavity) : the other, between 

 the tendon of the m. semimembrandsus 

 and the condvlus medialis tibiae (see 

 Fig. 396). 



Bursa bicipitogastroonemialis, 

 very rare, between the tendon of the 

 ni. biceps on the one side, the caput 

 laterale m. gastrocnemii and m. plan- 

 taris on the other side: it is bounded 

 medianward and behind by the n. pero- 

 naeus communis. 



Bursa subcutauea caleanoa (not illustratiMl). constant, in tlu' sole of the foot, just 

 beneath tlie skin on tlic inferior surface of the tuber calcanei. 



Bursa suboutanea tendinis calcanei [Achillis] (see also Fig. 409), frequently present 

 on till' I'ostin'ior surface of the tuber calcanei. 



M. flexor 

 digitorum longus 



Malleolus 

 medialis 



Tendo 

 calcaneus 

 lAchillisJ 



Tuber calcanei 



M. soleus J 



Cutis 



peronaeus longus 



M. peronaeus brevis 

 ^lalleolus lateralis 



Retinaculum 

 mm. peronaeorum 

 superius 



Bursa subcutanca 



tendinis calcanei 



