OSTEOLOGY. 



69 



neus longus, behind which is a rid ye for the long calcaneo-cuhoid 

 ligament, terminating externally in the tuberosity of the cuboid. 



The external surface has a deep notch, the outer extremity of 

 the peroneal groove. 



The posterior surface has triangular facet for os calcis, the 

 anterior has two facets, separated by a ridge for the fourth and 

 fifth metatarsals, and the internal surface has broad, square facet 

 for external cuneiform, and sometimes a smaller facet for sca- 

 phoid. 



FIG. 29. 



1, os calcis; 2, 2, outer and inner tuberosity; 3, groove for flexor 

 longus pollicis; 4, head of astragalus; 6, tubercle of scaphoid: 7, 8, 

 9, internal, middle, and external cuneiform bones; 10, cuboid; 11, 

 groove for peroneus longus; 12, 12, metatarsal bones; 13, 14, 15, 

 phalanges. 



It articulates with four and occasionally with five bones. 



It has one muscular attachment part of flexor brevis pol- 

 licis. 



SCAPHOID, or navicular bone, is a boat-like bone placed be- 

 tween astragalus and three cuneiform bones. 



Its posterior concave surface articulates with head of as- 

 tragalus, its anterior convex surface has three facets for cunei- 

 form bones; its inlennil Intnlcr presents the tuberosity of the 

 scaphoid- for insertion of tibialis posticus, the only muscular at- 

 tachment. Its other borders are roughened for ligamentous at- 

 tachment. 



