168 



THE SKELETON 



Articulations.— A\'ith the scaphoid, middle cuneiform, and the first and second 



nu'tutarsals. i ^ . j ^ 



Muscles.— Til.ialis amicus and posticus, the peroneus longus, and hrst dorsal 



intero.s^i'ous. . , r xi xu- j 



Ossification.— A single nucleus, which appears m the course of the third year 

 The MIDDLE CUNEIFORM, the smallest of the throe, has its base directed 



up\Yards and tlie sharp border dowmvards. The posterior concave surface is 



Fig. 179.— The Left Middle Cuneiform. (Internal .surface.) 



FOR :NTERNAL cuneiform 

 FOR SECOND METATARSAL 



articular for t"he middle facet of the scaphoid. The anterior, somewhat narrower 

 than the ])osterior surface, articulates with the hase of the second metatarsal. The 

 internal surface has a facet extending along its upper and posterior ])orders for the 



Fig. Ij-^O. — The Left Middle Cukeifoem. (External surface.) 



OCCASIONAL FACET FOR EXTERNAL CUNEIFORM 



FOR EXTERNAL CUNEIFORM 

 FOR SCAPHOID 



internal cuneiform. The external surface has a facet along the posterior border, 

 and occasionally one at the anterior inferior angle for the external cuneiform. 



Articulations. — ^^'ith the internal and external cuneiform bones, the scaphoid 

 and thf second metatarsal. 



Ossification. — A single nucleus appears in the fourth year. 



Tlie EXTERNAL CUNEIFORM has its base directed upwards, and its narrow 

 border downwards. The posterior surface is faceted for the scaphoid; and the 

 anterior, triangular in shape articulates with the base of the third metatarsal. 



Fig. 181.— The Left External Cuneiform. (Internal surface.) 



i 



FOR MIDDLE CUNEIFORM 



FOR SCAPHOID 



(p;-'-;- • /! ^ FOR SECOND METATARSAL. THE 



;- %;*■- .■■ 1 THE INFERIOR ANGLE IS FOR 



CIRCULAR FACET AT 

 THE MIDDLE CUNEI- 



'^' 



The internal surface has a large facet, extending along the posterior border, for 

 the middle cuneiform; and on the anterior border, a narrow irregular facet for the 

 outer border of the base of the second metatarsal; and occasionally a small facet 

 at the anterior inferior angle for the middle cuneiform. The outer surface has a 

 l)roa(l distinctive facet, near its ])osterior superior angle, for the cuboid; and at the 

 anterior superior angle there is usually a facet for the inner side of the base of the 

 fourth metatarsal. 



