132 



THE BONES OF THE LOWER LIMB. 



The middle cuneiform bone has its base directed upwards, and the sharp 

 edge downwards towards the sole. The posterior end is somewhat broader than the 

 anterior. On the inner side is an L-shaped articular surface, corresponding to that 



on the internal cuneiform bone ; and 

 on the outer side is a smaller facet, at 

 the posterior part, for the external 

 cuneiform bone. 



The external cuneiform bone is 

 also situated with its base upwards. At 

 its anterior end is a triangular articular 

 surface for the third metatarsal bone, 



Fig. 149. RIGHT INTERNAL CUNEIFORM BONE : 

 A, INNER VIEW; B, OUTER VIEW. (G. D. T.) 



and continuous with this are small 

 facets on the fore part of each lateral 

 surface, for the second and fourth meta- 

 tarsal bones. On the internal surface, at the posterior part, is an articular facet 

 for the middle cuneiform bone, and on the outer surface a much larger one for the 

 cuboid bone. 



The cuboid bone is situated on the outer side of the foot, between the 



A. 



B. 



Fig. 150. RIGHT EXTERNAL CUNEIFORM BONE: A, INNER TIEW ; B, OUTER VIEW. (G. D. T.) 



calcaneum and the fourth and fifth metatarsal bones. It deviates from the cuboid 

 form and becomes rather pyramidal, by the sloping of four of its surfaces towards 

 the short, rounded external border. Posteriorly it articulates with the os calcis,"and 

 the lower internal corner projects backwards as a conical process beneath the anterior 



.CUM. B. 



OS CALCIS 



CALC. CUB. LICT. 



FACET ON TUBEROSITY 



Fig. 151. RIGHT CUBOID BONE: A, INNER VIEW; B, OUTER VIEW. (G. D. T. ) 



extremity of that bone. Its anterior surface, smaller than the posterior, is divided 

 into an internal quadrilateral and an external triangular facet, articulating with the 

 fourth and fifth metatarsal bones. On its internal aspect in the middle, and 

 reaching the superior border, is a surface for articulation with the external cuneiform 

 bone ; and behind this, in many instances, is a smaller facet articulating with the 

 navicular, while the remainder is rough for ligaments. The superior surface, 

 looking upwards and outwards, is on the whole flat, but rather rough. On the 

 inferior surface is a thick oblique ridge or tuberosity, the outer end of which 



