84 THE SKELETON OF THE CAT. 



facet is borne on a projection of the bone, the sustentaculum 

 tali (V). Distad of the facets the surface is rough. The ventral 

 surface is smooth. The proximal end (b} is grooved for the 

 tendon of Achilles. The lateral surface is smooth and marked 

 by a grooved tubercle, the peroneal tubercle (d}, near the distal 

 end. The medial surface is marked by part of the articular 

 facet for the astragalus, and also by the grooved sustentaculum 

 tali. The distal end (a) articulates with the cuboid. 



Cuboid. Os cuboidcum (Fig. 58, c]. The cuboid has 

 somewhat the form of a cube and articulates by its proximal 

 end with the calcaneus (a), and by its distal end with the fourth 

 and fifth metatarsals. Its medial surface articulates with the 

 scaphoid (d} and lateral cuneiform (e}. The ventral surface is 

 marked near its distal end by an oblique ridge, distad of which 

 is a deep groove, the peroneal groove (/i), for the tendon of 

 the peroneus longus muscle. 



Scaphoid. (Os naviculare pedis BNA] (Fig. 58, d}. 

 The scaphoid is a boat-shaped bone. Its proximal surface is 

 marked by a concave facet for the head of the astragalus (), 

 and its distal surface has three facets for the lateral (/), inter- 

 mediate and medial (g) cuneiform bones. At the junction of 

 the ventral with the medial surface is a prominent tubercle. 

 The lateral surface bears two linear facets for articulation with 

 the calcaneus () and cuboid (c]. 



Lateral Cuneiform. Ectocuneiform. Os cuneiforme tcr- 

 tium BNA (Fig. 58, e). The lateral cuneiform is a wedge- 

 shaped bone with a hooked process extending from the ventral 

 sharp angle of the bone. It articulates by its proximal end 

 with the scaphoid (d], and by its distal end with the third 

 metatarsal. The medial surface bears near its distal end two 

 facets for the second metatarsal, and on its proximal end a 

 facet for the intermediate cuneiform. The caudal surface has 

 a facet on its proximal end for the cuboid (c). 



Intermediate Cuneiform. Mesocuneiform. Os cuneiforme 

 secundum BNA. The intermediate cuneiform is small and 

 wedge-shaped, with the base of the wedge dorsad. It lies 

 between the lateral cuneiform and the medial cuneiform, articu- 

 lates by its proximal end with the middle facet of the scaphoid, 



