THE LEG 



345 



through both the transverse and cruciate ligaments. On 

 the foot it inclines medially, and, turning round the medial 

 margin, gains insertion, by two slips, into the medial and 

 distal part of the first cuneiform bone, and into the adjoin- 

 ing part of the base of the first metatarsal bone. The tibialis 

 anterior is supplied by the deep peroneal nerve. It is a dorsi- 

 flexor and an inverter of the foot. 



M. Extensor Digitomm Longus. The extensor longus 

 digitorum muscle arises, for the most part, from the 

 structures which form the lateral portion of the wall of the 



M. ext. hallucis longus 

 M. ext. dig. longus ^\ -; 

 Peronaeus brevis v ,, \ < . 

 Superficial peroneal 

 nerve> 



Peroneal -| 



artery 



M. flexor hal- 

 lucis longus 



.** M. flex, dig. 'long. 



Posterior tibial 

 "" artery 

 ...Tibial nerve (O.T. 



posterior tibial) 



-/'-- M. plantaris 



Sural nerve and small sapbenous vein 



FIG. 155. Transverse section through the Middle of the Leg. 



anterior crural region. Thus, it springs from the distal part 

 of the lateral condyle of the tibia, from the head of the 

 fibula, and from the proximal three-fourths of the anterior 

 part of the medial surface of the body of the fibula 

 (Fig. 154, p. 343). It takes origin also from a small portion 

 of the proximal part of the interosseous membrane, the 

 deep investing fascia of the leg, the anterior fibular septum, 

 and the inter-muscular septum which lies between it and 

 the tibialis anterior. The tendon of the extensor digitorum 

 longus descends anterior to the ankle joint, and, passing 

 through the transverse and cruciate ligaments (p. 339), 

 divides into four slips, which diverge from each other on 



