THE POSTERIOR LIMB. 
227 
includes the typical extensors and flexors of the foot, together with 
the peronaei muscles, which individually are extensors and flexors, 
but collectively have the relation of lateral tractors (Fig. 77). 
A. Extensor group. Muscles occupying an anterior position 
on the leg and inserted on the dorsum of the foot. 
(a) The extensor hallucis longus. 
Origin: Middle portion 
of the anteromedial surface of the tibia and from the medial 
condyle behind the 
tibial collateral lig- 
ament. Insertion: 
The tendon passes 
around the medial 
malleolus of the 
tibia and beneath 
the base of the sec- 
ond (first functional) 
metatarsal, continu- 
ing to its dorsal 
surface and uniting 
with the first tendon 
of the extensor digi- 
torum 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 an- 
terior. ‘Origin: 
Lateral condyle of 
the tibia and corresponding surface of the tibial tuberosity. 
sertion: Base of the second metatarsal. 
Anterior 

Medial 
Lateral ect 
Posterior 
FIG. 77. Transverse section of the proximal 
portion of the leg: a.s.m., great saphenous 
artery; a.s.p., small saphenous artery; a.p.,; 
a.t.a., anterior tibial artery; b.f., biceps femoris 
(insertion) ; e.d.J., extensor digitorum longus; 
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; 
pl., 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 personaei (pri- 
mus-quartus). 
e.h.l., 
In- 
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 liga- 
ment. 
