252 



SPECIAL ANATOMY OF THE SKELETON 



portion for articulation with the external cuneiform; on the outer side a single 

 facet, for articulation with the fifth metatarsal. 



The fourth metatarsal is known by its having a single facet on either side of the tarsal extrem- 

 ity, that on the inner side being divided into two parts. If this subdivision be not recognizable, 

 the fact that its tarsal end is bent somewhat outward will indicate the side to which it belongs. 



Attachment of Muscles. To five Adductor obliquus hallucis, Third and Fourth dorsal, 

 and Second plantar interossei, and a slip from the tendon of the Tibialis posticus. 



The fifth metatarsal bone, or the metatarsal bone of the little toe (os metaiarsale V} 

 (Fig. 205), is recognized by the tubercle (tuberositas ossis metatar sails V} on the 

 outer side of its base. It articulates behind, by a triangular surface cut obliquely 

 from without inward, with the cuboid, and internally with the fourth metatarsal. 



For third 

 metatarsal. 



For cuboid. 

 For ext. cuneiform. 



FIG. 204. The fourth metatarsal. (Left.) 



For fourth 

 metatarsal. ^ 

 For cuboid. 



Tuberosity. 



FIG. 205. The fifth metatarsal. (Left.) 



The projection on the outer side of this bone at its tarsal end at once distinguishes it from 

 the others, and points to the side to which it belongs. 



Attachment of Muscles. To six the Peroneus brevis, Peroneus tertius, Flexor brevis 

 minimi digiti, Adductor transversus hallucis, Fourth dorsal, and Third plantar interossei. 



Articulations. Each bone articulates with the tarsal bones by one extremity (proximal), and 

 by the other (distal) extremity with the first row of phalanges. The number of tarsal bones 

 with which each metatarsal articulates is one for the first, three for the second, one for the third, 

 two for the fourth, and one for the fifth. 



The Phalanges of the Foot (Phalanges Digitorum Pedis). 



The phalanges of the foot, both in number and general arrangement, resemble 

 those in the hand; there being two in the great toe and three in each of the other 

 toes. The nutritive foramina correspond to those in the phalanges of the hand. 



The first or proximal phalanx (^phalanx prima) resembles closely the corre- 

 sponding bone of the hand. The shaft also is compressed from side to side, 

 convex above, concave below. The proximal extremity is concave; and the distal 

 extremity presents a trochlear surface, for articulation with the second phalanx. 



