462 SURGICAL APPLIED ANATOMY. [Chap. xxiu. 



In the interval between it and the last-named process 

 lies the calcaneo-scaphoid ligament, and the tendon of 

 the tibialis posticus. Farther towards the front of 

 the foot can be felt the ridge formed by the base of 

 the first metatarsal bone, and between it and the 

 scaphoid tubercle lies the inner cuneiform bone. Lastly, 

 the shaft of the first metatarsal bone, its expanded 

 head, and the sesamoid bones that lie on the plantar 

 aspect of the metatarso-phalangeal joint can be more 

 or less distinctly defined. On the outer side of the 

 foot the external surface of the os calcis is subcutaneous 

 in nearly the whole of its extent. Less than an inch 

 below and in front of the malleolus is the peroneal 

 tubercle, with the short peroneal tendon above it and 

 the long one below it. Some two and a half inches 

 from the outer malleolus the projection of the base of 

 the fifth metatarsal bone is very evident, and extending 

 for an inch or so behind it lies the cuboid bone. 



Joint lines. The ankle-joint lies about on the level 

 of a point half an inch above the tip of the inner 

 malleolus. Immediately behind the tubercle of the 

 scaphoid is the astragalo-scaphoid articulation, and a 

 line drawn transversely across the dorsum of the foot, 

 just behind this process, very fairly corresponds to the 

 mid-tarsal joint (the joint compounded of the astragalo- 

 scaphoid and calcaneo-cuboid articulations). 



If the latter articulation be approached from the 

 outer side it will lie opposite a point midway between 

 the outer malleolus and the prominent base of the 

 fifth metatarsal bone. 



The lines of the articulations between the first 

 and fifth metatarsal bones and the inner cuneiform 

 and the cuboid respectively are easily indicated, being 

 placed just behind the bases of the former bones. 

 The metatarso-phalangeal articulations are situated 

 about one inch behind the webs of the correspond- 

 ing toes. 



