Muscles of the Leg-. 



347 



Cavuiu 

 articulare 



Tendo 

 m. poplitei- 



Ligamen- 

 tum col- _ 



laterale 



fib ul are 



Capituluiu ._ 

 fibulae 



Space for 

 . the n. 

 peronaeus 

 profundus 



Membrana 



interossea- 



cruris 



Septum 



inter- 



musculare 



anterius 



[fibulare] 



392. Muscles of the right leg 



(2^^ layer), viewed from in front. 



(The mm. tibiaHs anterior, extensor digi- 



toram lougus, and peronaeus longus have 



been removed; the lig. cruciatum cruris 



has been partially cut open.) 



M. extensor liallucis lougus (0. T. 



extensor proprius hallucis) (see also Figs. 

 390, 391, 401, 402 and 405). Form: flat, 

 oblong. Position: on the anterior surface 

 of the leg, below just beneath the skin, 

 above overlapped by its two neighbors: 

 bounded lateralward by the m. extensor digi- 

 torum longus, medianward by the m. til)ia- 

 lis anterior. Origin: membrana in terossea 

 cruris and facies m3dialis fibulae. Inser- 

 tion: the fibers run parallel forward and 

 downward to a flat tendon Ijeginniug median- 

 ward in the inferior third: this extends, 

 through the lateral compartment of the lig. 

 transversum and thi-ough the middle com- 

 partment of the lig. cruciatum criuis, for- 

 ward and medianward to the dorsal surface 

 of the OS metatarsale I and, after partial 

 union with the tendon of the m. extensor 

 hallucis brevis. to the base of the second 

 phalanx of the great toe; with the first 

 phalanx it is connected by short bands. 

 Action: it flexes the foot dorsal ward, it 

 elevates the medial margin of the foot, it 

 extends the first toe dorsalward. Inner- 

 vation: n. peronaeus profundus. 



The fascia cruris covers the free sur- 

 face of the muscles of the leg. It is con- 

 nected at the knee with the fascia lata, is 

 stronger on the anterior surface above than 

 below and, near the ankle-joint, is streng- 

 thened by a broad band of transverse fibers, 

 the iigamentum transversum cruris (0. T. 

 broad part of anterior annular ligament) 

 (see Figs. 391, 401 and 402). This is attached 

 at its ends to the fibida and tibia and 

 is divided, by a septum going to the 

 tibia, into two compartments: one medial 

 for the m. tibialis anterior, one lateral for 

 the mm. extensor hallucis longus and ex- 

 tensor digitorum longus : the lower margin 

 of the ligament is connected medianward 

 with the upjjer medial limb of the lig. cru- 

 ciatum cruris. On the back of the leg the 

 fascia covers not only the m. triceps surae 

 fi-om behind, but also, passing in front of 

 it, covers the mm. flexores longi and tibialis 

 posterior: it thus forms a superficial and 

 a deep layer. Medianward, upon the facies 

 raedialis tibiae, the fascia is fused with the 

 periosteum. Lateralward it sends a striji 

 to the fibula, in front of and behind the 

 mm. peronaei. septum intermuscular e an- 

 terius ffibularej and septum intermuscu- 

 lare posterius [fibulare] (see also Fig. 396), 

 form which the muscles arise in part. 



M. articularis 

 genu 



Tendo m. 

 quadricipitis 



femoris 

 ~ (cut off) 



Ligamentum 



collaterale 



tibiale 



Meniscus 

 medlalis 



Ligamentum 

 patellae 



Tuberositas 

 tibiae 



Crista anterior 

 tibiae 



M. 

 peronaeus 

 brevis 



. M. extensor 

 hallucis longus 



Malleolus 

 lateralis 



M. extensor 



digitorum 



brevis 



Malleolis 

 medialis 



Ligamentum 

 cruciatum 



M. extensor 

 hallucis 

 longus 



