26o 



A MANUAL OF ANATOMY 



Articulations. — Posteriorly with the astragalus, anteriorly with the 

 three cuneiform bones, and sometimes with the cuboid externally. 

 Structure. — The structure is that of a short bone. 



Variety. — The tuberosity sometimes forms a separate ossicle. 



The Cuneiform Bones. 



The cuneiform bones are three in number, namely, internal, 

 middle, and external. They are situated between the navicular and 

 the inner three metatarsal bones, and are characterized by their 



Dorsal Surface 



Anterior Surface for ist Metatarsal Ji 



Posterior Surface for Navicular 

 - For Tibialis Anticus 



Posterior Surface for Navicular.-:^. — ■ 



For 2nd Metatarsal 



"---■-For Middle Cuneifom 



B 



Fig. 152. — The Right Internal Cuneiform Bone. 

 A, Internal View ; B, External View. 



wedge shape. The internal cuneiform is the largest, and the middl 

 is the smallest. 



The internal cuneiform bone is situated on the inner side of tl 

 foot, where it lies with the narrow end of the wedge upwards, and 

 supports the first metatarsal. The dorsal surface is narrow anc 

 rough. The plantar surface is thick and convex, and posteriorly 

 it presents an eminence for a slip of the tendon of the tibiali> 

 posticus. The internal stuface is traversed by an oblique groove, 

 directed downwards and forwards, for the tendon of the tibialis 



