760 MAMMALIAN ANATOMY 



border is slightly elevated, and shows an obscure facet for articulation 

 with the proximal part of the fibular surface of the ectocuneiform. 

 The tibial surface faces toward the sole of the foot as well as toward 

 the tibial side. There is no plantar surface, merely a rounded plantar 



border. 



FIG. 575. 



Dorsal Side. 



Dorsal Surface. -S~^\ 

 With Second Metatarsal.l- ) 



Tibial Side. \ /\ , Fibular Side. 



With Entocuneiform.-\ L> 



Plantar Side. 



LEFT MESOCUNEIFORM, DISTAL SURFACE. 



The fibular surface has the general shape of the tibial surface, 

 that is, square, with one angle, the disto-plantar, prolonged. The 

 proximal border shows two facets which articulate with a small and 

 slightly convex semilunar facet, or two facets, on the proximal border 

 of the tibial surface of the ectocuneiform. The surface is rough below 

 for an interosseous ligament. 



FIG. 576. 

 Dorsal Side. 



Dorsal Surface. 

 With Entocuneiform. /T 71 



Proximal Side. With Scaphoid.-! ^\-^ a f^ai Distal Side. 



kJ|ujr V For Interosseous 

 ^^*saJ Ligament. 



Plantar Side. 



LEFT MESOCUNEIFORM, TIBIAL SURFACE. 



Nomenclature. Mesocuneiform is compounded of meson, middle, 

 and cuneiform, wedge-shaped. Middle cuneiform, os cuneiforme secun- 

 dum, and tarsale II. are also used. In German we find das zweite 

 oder mittlere Keilbein, and in French le deuxie'me cuneiforme. 



Determination. When the bone is held with the dorsal surface 

 uppermost and the proximal surface toward the student, the flat, fibular 

 side faces to the side to which the bone belongs. 



Articulation. The mesocuneiform articulates with the scaphoid, 

 the ectocuneiform, the entocuneiform, and the second metatarsal bone. 



Ossification. The mesocuneiform is developed from one centre. 



