The Posterior Limb. 



151 



dyle behind the tibial collateral ligament. Insertion : The 

 tendon passes around the medial malleolus of the tibia and 

 beneath the base of the second metatarsal, uniting with the 

 first tendon of the extensor digitorum longus. 



The posterior tibial artery, the continuation of the great saphenous, 

 and the tibial nerve accompany the tendon in the malleolar groove. 



(b) The tibialis anterior. Origin: Lateral condyle of the tibia 

 and corresponding surface of the tibial tuberosity. Insertion : 

 Base of the second metatarsal. The tendon passes beneath 

 the obliquely placed crural ligament of the lower portion of 

 the leg. 



The muscle should be divided and its head reflected. 



The anterior tibial artery and vein, and the peroneal nerve appear 

 on the anterior surface of the tibia at the lateral side of the crural 

 ligament. 



(c) The extensor digitorum Mlerhr 

 longus. Origin : By a 



flattened tendon from 

 the lateral margin of 

 the facies patellaris of 

 the femur. This ten- 

 don passes through 

 the capsule of the 

 knee - joint, and the 

 fleshy portion of the 

 muscle lies on the 

 anterolateral surface 

 of the tibia. Inser- 

 tion: The distal ten- 

 don passes beneath 

 the crural ligament, 

 then beneath the cru- 

 ciate ligament of the 

 dorsum of the foot, 

 dividing into four por 



bf- 



Fig. 49. Transverse section of the proximal 

 portion of the leg: a.p., peroneal artery; a.s.m., 

 tions for insertion On great saphenous artery; 'a s.p. small saphenous 

 artery; a.t.a., anterior tibial artery, b.f., biceps 

 femoris (insertion); e.d.l., extensor digitorum 

 longus; e.h.l., extensor hallucis longus; f., fibula; 

 f.d.l., flexor digitorum longus; g.l., and g.m., lateral • 

 and medial heads of the gastrocnemius; gr., gracilis 

 (insertion tendon); n.s., greater saphenous nerve; 

 n.s.m., lesser saphenous nerve; n.t., tibial nerve; 

 pi., plantaris; s., soleus; t., tibia; t.a., tibialis 

 anterior; t.f.c, tensor fasciae cruris (insertion); 

 v.is., sciatic vein; v.s.m., great saphenous vein; 

 v.s.p., small saphenous vein; 1-4, the peronaei (pri- 

 mus-quartus). 



all the phalanges of 

 the digits. 



The muscle may be dis- 

 placed by dividing the 

 crural ligament. 



The peroneal and ante- 

 rior tibial arteries lie 

 behind this muscle, the 



former in a medial posi- 

 tion, in contact with the tibia, the latter on the peronaei muscles in 

 company with the peroneal nerve. 



B. Peronaeus group. These muscles arise from the lateral surface of 

 the leg, and are inserted on all surfaces at the lateral side of the foot. 

 The insertion tendons reach the foot from beneath the lateral malleolus. 



