184 ANATOMY IN A NUTSHELL. 



of the Extensor proprius hallucis and Tibialis anticus to the inner malleolus. 

 6) The cMcrnal malleolar passes under the tendons of the Extensor longus 

 digitorum and Peroneus tertius to the outer malleolus. 



The Relations of the Anterior Tibial Artery. 



l.\ Front.- -(1) Integument, (2) Superficial and deep fascia, (3) An- 

 terior tibial nerve, (4) Tibialis anticus (overlaps it in the upper part of the leg), 

 (5) Extensor longus digitorum (overlaps it slightly,) (6) Extensor proprius 

 hallucis (overlaps it slightly). (7) Anterior annular ligament. 



BEHIND. — (1) Interosseous membrane, (2) Tibia, (3) Anterior ligament 

 of ankle-joint. 



Outeb Side. — (1) Anterior tibial nerve, (2) Extensor longus digitorum, 

 (3) 1 Jxtensor proprius hallucis. 



Iwii; Side. — (1) Tibialis anticus, (2) Extensor proprius hallucis (crosses 

 it at it- lower part). 



The dorsalis pedis artery (Plates LXXII-LXXYI.) is the continuation of 

 the anterior tibial. It passes along the inner side of the foot from the ankle- 

 joint to the first intermetatarsal space, where it divides into dorsalis hallucis 

 artery and the communicating artery. The dorsalis hallucis artery, also called 

 firsi dorsal interosseous, passes in the first interosseous space to the base of the 

 mvat toe where it divides into two branches which pass to the dorsal aspect of 

 the adjacent sides of the great and second toes. Prior to this division it gives 

 off a branch which passes under the Extensor proprius hallucis tendon and runs 

 along the dorsal aspect of the inner side of the great toe. The communicating 

 branch, also called the plantar digital, passes between the two heads of the First 

 dorsal interosseous muscle to join the external plantar artery, thus completing 

 the plantar arch, it now gives off the arteria princeps hallucis which runs 

 along the plantar surface of the first interosseous space and divides at the base 

 of the toes into two branches for the plantar aspect of the sides of the great toe. 

 Besides these terminal branches it gives off (1) external tarsal, (2) internal 

 tarsal. These branches run outward and inward across the cuboid and scaphoid 

 bones. (3) Metatarsal which passes across the base of the metatarsal bones ex- 

 ternally. This artery gives off three interosseous arteries which pass in 

 the three outer interosseous spaces to the base of the toes where they divide 

 into internaland external branches for the dorsalaspect of adjacentsides of the 

 four outer toes. The outer interosseous branch before its division at the base 

 ofthetoes sends :i branch along the dorsal aspect of the outer side of the little 

 toe. These three arterieseach receives aposterior perforating branch from the 

 plantar arch a1 the base of the space, also an anterior perforating branch from 

 the digital artery ;it the front of the space. 



The Relations of the Dorsalis Pedis Artery. 



I\ Front. (1) [ntegument, (2) Fascia, (3) Anterior annular ligament, 

 I Innermost tendon of Extensor brevis digitorum. 



Behind.- (1) Astragalus, (2) Navicular, (3) Middle cuneiform, (4) The 



ligament- to these bones. 



Outeb Side. — (1) Extensor longus digitorum, (2) Anterior tibial nerve. 

 Iwii; Side. Extensor proprius hallucis. 



