94 THE POCKET ANATOMY 



inner side of head of fibula to midway between the two 

 malleoli will mark its course. 



Relations. Tibialis anticus to inner side, the extensor com- 

 munis digitorum above, and the extensor proprius hallucis 

 below upon its outer side, covered below by annular ligament 

 and crossed by extensor proprius hallucis tendon, rests below 

 upon the anterior surface of the tibia. It is accompanied by 

 two venae comites. Anterior tibial nerve lies at first on outer 

 side, then becomes superficial, and below is on the outer side. 



Branches : 



Posterior Tibial Recurrent : passes upwards deep to popli- 

 teus to back of knee. 



Superior Fibular: passes over neck of fibula, through soleus, 

 to peroneus longus. 



Anterior Tibial Recurrent : arises as artery reaches anterior 

 surface of interosseous membrane, passes in tibialis anticus 

 to external and anterior surfaces of knee-joint ; anas, articular 

 of popliteal. 



Malleolar : Two in number, arise just above ankle-joint, 

 supplying it. 



Internal. Passes beneath extensor longus hallucis and 

 tibialis anticus tendons to inner malleolus ; anas, branches 

 of posterior tibial. 



External. Passes outwards beneath extensor longus digi- 

 torum and peroneus tertius ; anas, anterior peroneal, tarsal of 

 dorsalis pedis. 



Muscular : to surrounding muscles. 



DORSAL ARTERY OF FOOT. 



Extent. From bend of ankle to posterior part of ist inter- 

 osseous space, ending by anastomosing with external plantar 

 artery to form plantar arch after it has entered sole between 

 heads of origin of ist dorsal interosseous muscle. 



Relations. Lies between tendons of extensor proprius 

 hallucis and extensor longus digitorum ; near termination 

 it is crossed by innermost tendon of extensor brevis digitorum. 

 Bound down by fascia lying on astragalus, scaphoid, and 

 middle cuneiform. Accompanied by two venae comites. 

 Anterior tibial nerve lies to outer side. 



branches : 



Tarsal : arises as artery crosses scaphoid, courses forwards 

 and outwards beneath extensor brevis digitorum, supplying 

 it, then backwards to cuboid; anas, external plantar, meta- 

 tarsal, external malleolar, anterior peroneal. 



