Muscles of the Jjes. 



351 



396. Muscles of the right leg 



(4*^ layer), viewed from behind. 



(All the muscles have been removed with the 



exception of the mm. tibialis posterior and peru- 



naeus brevis.) 



iii 



Planum popliteuu 

 feiuoris 



Ligamentum 



collaterale 



tibiale 



Bursa 



m. seiiiiiufiu- 



branosi 

 M. semimem- 

 branosus 

 (cut off) 



\\ 



M. popliteus 



(cut off) 



Facies posterior 

 tibiae 



M. tibialis posterior 



M. perouaeus lougus (see Figs. 390, 391, 

 393395, 400, 407 and 409). Form: flat, 

 oblong, penniform. Position: superficial on 

 the lateral surface of the leg, above upon the 

 fibula, below upon the m. peronaeus bre\'is; 

 bounded in front by the m. extensor digitorum 

 lungus, behind by the m. soleus. Origin: capi- 

 tulum and facies lateralis fibulae, fascia cruris 

 and septa intermuscularia [fibularia]. Inser- 

 tion: the fibers go obliquely downward to a 



tendinous strip; the flalf'tendon extends down- ')\Wf /' 



ward at first on the lateral, then on the poste- ' ' 



rior surface of the m. peronaeus brevis in a curve 

 behiaid and below the malleolus lateralis, upon 

 the lig. calcaneofibulare to the sulcus m. peronaei 

 [longi] of the calcaneus and is held in place by 

 the retinacula mm. peronaeorum (see p. 345); 

 thence it runs in the sulcus m. peronaei [longi] 

 upon the tuberositas oss. cuboidei to the sole of 

 the foot and there, covered plantarward by all 

 the muscles and by the lig. plantare longum, it 

 goes obliquely forward to the medial border of 

 the foot; it is attached to the os cuneiforme I and 

 OS metatarsal I (see Fig. 268). In front of the 

 tuberositas oss. cuboidei it often contains a sesa- 

 moid cartilage, rarely a sesamoid bone. Action: 

 it flexes the foot plantarward and pronates it. 

 Innervation: n. peronaeus superficialis. 



M. tibialis posterior (see also Figs. 395 

 and -405407). Form: flat, oblong, penniform. 

 Position: directly upon the posterior surface of 

 the bones of the leg and of the membrana inter- 

 ossea cruris, above between the mm. flexor digi- 

 torum longus and flexor hallucis longus, covered 

 below by these, above and below also by the m. 

 soleus. Origin: facies posterior tibiae, mem- 

 brana interossea cruris and facies raedialis fibulae. 

 Insertion: the fibers run obliquely downward 

 to a tendinous strip situated on the medial mar- 

 gin : the round tendon, going out of it above the 

 malleolus niedialis , extends , directly upon the 

 tibia in front of the m. flexor digitorum longus, 

 downward and medianward to the sulcus malleo- 

 laris tibiae. It is there held in place by the 

 lig. laciniatum, goes in a curve to the medial 

 side of the ligg. talotibiale posterius and calcaneo- 

 til)iale, thence on the medial and inferior surface 



of the lig. calcaneonaviculare plantare to the sole ^ , . 



of the foot and, lying directly upon the bones nnVanAi \ i, j'JI^^F^- 



and ligaments, it sends strong processes to the 

 tuberositas oss. navicularis and to the os cunei- 

 forme 1, and feebler processes to the ossa cunei- 



formia II and III, metatarsalia II, III, IV and cuboideum (see also Figs. 203 and 268). Action: 

 it flexes the foot plantarward and supinates it. Innervation: n. tibialis. 

 Bursa m. poplitei (see also Fig. 261) se,e p. 214. 



Bursa teudiuis calcanei [Acliillis] (see Fig. 395). constantly present, large, between 

 the posterior surface of the tuber calcanei and the tendo calcaneus [Achillis^. 



23* 



Ligamentum 



coUaterale 



flbulare 



Tendo 

 m. poplitei 



Bursa 

 m. poplitei 



Capitulum 

 fibulae 



Septum 



inter- 



musculare 



posterius 



M. 



peronaeus 



breyis 



Facies 



posterior 



fibulae 



Facies 



posterior tibiae 



M. tibialis 



posterior 



Malleolus 



medialis 



^I. flexor digi- 

 torum longus 



M. flexor hal- 

 lucis longus 



Ligamentum 

 laciniatum 



Tuber 

 calcanei 



:m 



\ 



peronaeus long 



Malleolus lateralis 



Retinaculum 

 ~ mm. peronaeon 

 superius 



,__ Articulatio 

 talocruralis 



