ANTERIOR TIBIO-FIBULAR REGION. 



341 



the leg, and gives attachment, by its inner sur- 

 face, to the Tibialis anticus and Extensor 

 longus digitorum muscles; but thinner behind, 

 where it covers the Gastrocnemius and Soleus 

 muscles. Its inner surface gives off, on the 

 outer side of the leg, two strong intermuscular 

 septa, which inclose the Peronei muscles, and 

 separate them from the muscles on the anterior 

 and posterior tibial regions, and several smaller 

 and more slender processes inclose the indi- 

 vidual muscles in each region; at the same 

 time, a broad transverse intermuscular septum 

 intervenes between the superficial and deep 

 muscles in the posterior tibio-fibular region. 



The fascia should now be removed by dividing it in 

 the same direction as the integument, excepting oppo- 

 site the ankle, wnere it should be left entire. The re- 

 moval of the fascia should be commenced from below, 

 opposite the tendons, and detached in the line of direc- 

 tion of the muscular fibres. 



MUSCLES OF THE LEG. 



These may be subdivided into three groups : 

 those on the anterior, those on the posterior, 

 and those on the outer side. 



ANTERIOR TIBIO-FIBULAR REGION. 



Tibialis Anticus. 

 Extensor Proprius Pollicis. 

 Extensor Longus Digitorum. 

 Peroneus Tertius. 



The Tibialis Anticus is situated on the outer 

 side of the tibia ; it is thick and fleshy at its 

 upper part, tendinous below. It arises from 

 the outer tuberosity and upper two-thirds of 

 the external surface of the shaft of the tibia ; 

 from the adjoining part of the interosseous 

 membrane ; from the deep fascia of the leg ; and 

 from the intermuscular septum between it and 

 the Extensor communis digitorum ; the fibres 

 pass vertically downwards, and terminate in a 

 tendon, which is apparent on the anterior sur- 

 face of the muscle at the lower third of the leg. 

 After passing through the innermost compart- 

 ment of the anterior annular ligament, it is 

 inserted into the inner and under surface of 

 the internal cuneiform bone, and base of the 

 metatarsal bone of the great toe. 



Relations. By its anterior surface, with the 

 deep fascia, and with the annular ligament. By 

 its posterior surface, with the interosseous mem- 

 brane, tibia, ankle-joint, and inner side of the 

 tarsus. By its inner surface, with the tibia. 

 By its outer surface, with the Extensor longus 

 digitorum. and Extensor proprius pollicis, the 

 anterior tibial vessels and nerve lying between 

 it and the last mentioned muscle. 



Fig. 191. Muscles of the Front of 

 the Leg. 



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