BONES. 



The external surface has, along its posterior and upper edges, 

 an L-shaped facet for the middle cuneiform and second meta- 

 tarsal. The posterior surface has a pyriform facet for the 

 navicular; the anterior surface is the longest and has a semi- 

 lunar facet for the first metatarsal. [246] 



Middle Cuneiform (the smallest and shortest) . The superior 

 surface is broad and convex ; the inferior is narrow. The inner 

 surface has, along its posterior and superior borders, an L- 

 shaped facet for the internal cuneiform ; the outer surface has 

 posteriorly a facet, often constricted mesially, for the external 

 cuneiform. The posterior surface has a triangular facet for the 

 navicular; the anterior surface has a wedge-shaped facet for 

 the second metatarsal. [246] 



External Cuneiform. The superior surface is broad and 

 convex; the inferior is narrow. The inner surface has two 

 narrow facets, often constricted mesially, along its anterior 

 and posterior borders, for the second metatarsal and middle 

 cuneiform respectively. The outer surface presents posteriorly 

 a large facet for the cuboid, and a small one, for the fourth 

 metatarsal, along the upper part of the anterior border. The 

 posterior end has a triangular facet for the navicular; the an- 

 terior has another for the third metatarsal. [247] 



Cuboid. This lies on the outer side, between the os calcis 

 and two outer metatarsals. The upper surface is almost plane; 

 the rounded outer surface is notched inferiorly by the peroneal 

 groove. The under surface presents a thick ridge running for- 

 ward and inward ; in front of the ridge is a groove (peroneal) ; 

 at the outer end of the ridge is a prominence (tubercle) with a 

 facet antero-externally for the sesamoid bone in the Peroneus 

 longus tendon. The internal surface has a facet, near the cen- 

 tre of its upper border, for the external cuneiform, and some- 

 times another behind this, for the navicular. The anterior sur- 

 face has a facet, subdivided by a vertical ridge, for the two 

 outer metatarsals. The posterior surface is semihmar, with a 

 pointed process (calcanean) at its inferior internal angle; it 

 17 [257] 



