350 



Muscles of the Le"'. 



Planum 

 'popliteum femoris 

 B. m. gastrocneniii 

 lateralis 



395. Muscles of the right leg 



(3''^^ layer), viewed from behind. 

 (The mm. gastrocnemius, plantaris and soleus 



have been removed.) 



M. semi- 

 membrano- 

 sus (cut off) 



M. popliteus 



N>^1 



Wi 



M. tibialis 

 posterior 



_ Caput laterale 

 ni. gastrocneniii 



Lig. collaterale 

 fibulare 

 Lig. popliteum 

 arcuatuni 

 Ketinaculum 

 ligamt-nti 

 arcuati 

 - Capitulum 

 fibulae 

 Opening 

 for the 

 n. peronaeus 

 communis 



M. 



peronaeus 

 longus 



M. flexor 

 digitorum longus 



l> 



M. tibialis 

 posterior 



Malleolus 

 mcdialis 



Capsula 

 articular is 



Ligamentuni 

 laciaiatum 



Tuber 

 calcanei 



Ji 



rri 



%.r--% 



hallucis, in the solephmtarwanl in ]i;irt liy the 



phintarward and sii]>inatrs it: it draws the 1^' 



Bursa m. gastrocnoinii lateralis, 



capsule of the knee-joint and 

 with tlio cavity of the joint. 



M. flexor digitorum loug-us (see also 

 Figs. 393, 399, 400, 405 and 406). Form: 

 iiat, oblong, penniform. Position: on the 

 back of the tibia and of the ra. tibialis poste- 

 rior, bounded laterally by this muscle and 

 by the m. flexor hallucis longus, covered by 

 the m. soleus. Origin: facies posterior tibiae 

 and the deep layer of the fascia cruris (see 

 ]). 347). Insertion: obliquely downward to 

 a tendinous strip, which goes over above the 

 malleolus into a roimded tendon ; this extends, 

 behind and below the tendon of the m. tibialis 

 ])osterior, mcdianward near the sulcus m. flexor 

 hallucis longi of the talus and at the medial 

 margin of the sustentaculum tali of the calca- 

 neus (see p. 141) to the sole of the foot, being 

 held fast by the deep layer of the lig. laciniatum 

 (see also Figs. 268 and 269). It then crosses, 

 plantarward, the tendon of the m. flexor haUucis 

 longus, receives from it a tendinous bundle and 

 breaks up into four diverging tendons : these 

 go to the 2"d 5th toe, perforate the tendons of 

 the m. flexor digitorum brevis and become fasten- 

 ed to the base of the 3id phalanx. The tendon 

 is covered on the medial border of the foot by 

 the m. abductor hallucis, in the sole plantarward 

 by the m. flexor digitorum brevis. Action: 

 it flexes the foot plantarward and supinates it : 

 it draws the 3rd phalanx of the 2"^ 5th toe 

 plantarward. Innervation: n. tibialis. 



M. flexor hallucis loiig'us (see also 

 Figs. 394, 399, 400 and 405-407). Form: 

 rounded , oblong , peunif\)rm. Position: on 

 the posterior surface of the flbula and of the 

 m. tibialis posterior; it is bounded medianward 

 by the m. flexor digitorum longus, lateralward 

 by the mm. peronaei, covered by the m. soleus. 

 Origin: facies posterior fibulae, septum inter- 

 innsculare posterius and the deep layet of the 

 fascia cruris (see p. 347). Insertion: the 

 fibers converge downward to a tendinous strip. 

 Behind the malleolus medialis begins the round- 

 ed tendon, which goes in the sulcus m. flexoris 

 hallucis longi of the talus and calcaneus, held 

 in position by the deeplayerof the lig. laciniatum 

 (see also Figs. 268 and 269), behind the tendon 

 of the m. flexor digitorum longus, to the sole of 

 the foot. There it crosses dorsalward the tendon 

 of the latter muscle, gives off a process to it, 

 which goes especially to the tendon bundle for 

 the 2n>i toe and extends between the bellies of 

 the m. flexor hallucis brevis tn the base of 

 the 2"*! phalanx of the l^t toe. At the margin 

 of the foot it is covered by the m. abductor 

 in. flexor digitorum brevis. Action: it flexes the foot, 

 ;ind 2"d toe ])lantarward. Innervation: n. tibialis. 

 (iften present l)(>tween the uppermost part of the 

 the caput laterale m. gastrocneniii: it frequently communicates 



M. flexor 

 ballucis 

 longus 



M. 



peronaeus 

 brevis 



Malleolus 

 lateralis 

 ^/' Ketinaculum 



mm. peronaeo- 



rum superius 



H. tendinis 



eak-anei 



Tendo 



calcaneus 



(cut off) 



