POSTERIOR TIBIAL 



591 



At the inner ankle it lies beneath the internal annular h<:,aiment and alxluctor 

 halhicis upcni the internal lateral lifjament of tlie ankle-joint. Here it has the 

 tibialis posticus and flexor longus dijijitoruni in front of it, and the j)osterior til)ial 

 nerve and the Hexor longiis lialliicis Ix-hind and to its outer side. 



At times the posterior tibial nerve divides higher than usual, when one branch 

 lies on the inner side of the artery, and the other branch on the outer side. 



The branches of the posterior tibial artery are: — (1) The peroneal; (2; the 



Fig. 377.— The Popliteal, the 



Posterior Tibial, and the Peroneal Artery, 

 Right Side. 



Semi-tendinosuB 

 Semi-membranoBus 



Sartorius 



Inferior internal articular artery LiJ 



Gracilis ___! 



Inner head of gastrocnemius, 

 hooked aside 



Injfriur sural artery 



Superior external articular artery 



Biceps 



Superiur sural artery 



Popliteal artery 



Flantaris muscle 



Inferior external articular artery 



Spot at which anterior tibial artery 

 passes to front of leg 



Tibialis posticus 



Soleus, turned back 



Posterior tibial artery 



Flexor longus digitorum 



Tibialis posticus 

 Flexor longus digitorum 



Communicating artery 



A nierior peroneal arteri/ passing to the 

 front between the bones 



Feroneus longus 

 Comnninicating artery 



muscular; (3) the medullary; (4) the cutaneous; (5j the communicating; (6) the 

 malleolar; (7) the calcanean, or internal calcanean; and (8) the terminal, i.e. the 

 external and internal plantar arteries. 



(1) The peroneal artery (tigs. 374, 377) arises from the posterior tibial about 

 one inch below the lower l)order of the popliteus muscle. At first forming a gentle 

 curve with the convexity outwards, it ajijn-oaches the fibula, and continues its course 

 downwards close to that bone as far as the lower end of the interosseous membrane, 



