Bones of the Lower Extremity. 



145 



For the os metatarsale \' 



For the 



facies articularis 

 cnboidea calcanei 



Tuberositas ossis cuboidei 1 



For the ossa meta- 

 tarsalia IV et V 



Sulcus m. peronaei [longi] 



For the os metatarsale IV 



For the os 

 cuneiforme III 



Sulcus m. perouaei [longij 



195 and 196. Right cuboid bone, os cuboideum. 



From the side. From in front. 



The os cuboideum (cuboid bone) (see also Figs. 188 203 and 271) is 

 very irregularly cuboidal in shape and lies in front of the calcaneus and on the lateral 

 side of the tarsus. It is longer medianward than lateralward. 



Its posterior surface, covered with cartilage, is directed also lateralward, is quadran- 

 gularly rounded, curved so as to be saddle - shaped (for the facies articularis cuboidea 

 calcanei); its distal surface supports two rounded quadrangular articular surfaces (for the 

 ossa metatarsalia IV et V) separated by a slight ridge; its medial surface shows a small 

 articular surface for the os cuneiforme III and usually also one for the os naviculare 

 (see Fig. 271). The upper and lateral surface is rough. The lower surface presents 

 an oblong bulging, the tuber ositas ossis cuboidei, above the anterior smooth portion 

 of which, covered lateralward with cartilage, (sulcus m. peronaei [longi]) the tendon 

 of the m. peronaeus longus glides. In front of the tuberosity is a rough groove extending 

 obliquely medianward and forward. 



10 



