388 Anatomy Applied to Medicine and Surgery. 



the incision in Syme's operation. The internal plantar 

 passes forwards along the inner side of the sole of the 

 foot to the inner side of the base of the first metatarsal 

 bone where it anastomoses with the princeps pollicis from 

 the communicating. 



Landmarks of the Foot. For the bloodvessels. 

 The line for the external plantar is drawn from a point, 

 midway between the tip of the inner malleolus and the cen- 

 tre of the convexity of the heel, to about one finger's 

 breadth from the tuberosity of the fifth metatarsal bone. 

 The portion constituting the arch is represented by a slight- 

 ly curved line drawn from the latter point, i.e., a finger's 

 breadth internal to the tuberosity of the fifth metatarsal 

 bone, inwards to the back of the first interosseous space. 

 The line for the internal plantar is drawn, from the same 

 point of origin as for the external, forwards to the middle 

 of the under surface of the great toe. 



Bony Prominences. On the dorsum, the bony 

 prominence felt below and about one inch in front of the 

 lower end of the tibia is the head of the astragalus. The 

 longitudinal ridge forming the highest point of the dor- 

 sum of the foot is composed, from behind forwards, of 

 the head of the astragalus, the scaphoid, the middle cune- 

 iform, and the second metatarsal bone. On the inner 

 side of the foot, there can be felt, from behind forwards, 

 the following prominences : The internal tuberosity of 

 the os calcis, the sustentaculum tali with the internal mal- 

 leolus above it, the tuberosity of the scaphoid, the base of 

 the first metatarsal bone and the head of the same with 

 the base of the first phalanx immediately in front of it, the 

 latter being increased in depth by the presence of the sesa- 

 moid bones beneath it. On the outer side is the external 

 tuberosity of the os calcis, next, the peroneal tubercle 

 some distance in front of this tuberosity and situated be- 



