DISSECTING MANUAL. 



outward and forms, with the groove under the astragalus, the 

 tarsal canal; to the front and inner side of this groove is an 

 elongated facet, often subdivided; all these facets are for the 

 astragalus. The inferior surface is concave antero-posteriorly 

 and convex transversely; posteriorly it presents two tubercles, 

 inner and outer, of which the inner is the larger; anteriorly an 

 elongated tubercle ends abruptly at the anterior border, often 

 forming a notch. The internal surf ace presents a broad groove 

 running downward and forward; a bracket-like process (SILS- 

 tentaculum tali, or lesser process) overhangs the groove in front, 

 and is also grooved on its lower surface. The external surface 

 is flattened and broadest behind; a process (peroneal spine) 

 springs from it just below the outer end of the tarsal canal. 

 The anterior extremity (greater process) has, on its anterior 

 surface, a saddle-shaped facet, for the cuboid, which is convex 

 transversely and concave vertically. The posterior extremity 

 (tuberosity) is oval, rounded, and divisible into three areas; 

 the highest area is smooth and crescentic; the intermediate 

 one is smooth and separated from the rough lowest area by an 

 irregular line. [243] 



Navicular (scaphoid). This lies on the inner side, between 

 the astragalus and cuneiforms. The posterior surface has a 

 large oval, concave facet for the astragalus. The anterior sur- 

 face has a semilunar facet which is subdivided by faint ridges 

 into three wedge-shaped facets for the cuneiforms. The su- 

 perior surface is convex transversely and rough; the inferior 

 is concave and rough ; the external is usually rough but may 

 have a facet for the cuboid. The inner surface is a rounded 

 projection (tubercle). [245J 



Cuneiform Bones. The three are wedge-shaped and lie 

 between the navicular and the three outer metatar- 

 sals. [245] 



Internal Cuneiform (the largest) . The upper, lower, and in- 

 ternal surfaces are rough and convex; at the front of the inner 

 surface is an oval impression for the Tibialis anticus tendon. 



[266] 



