210 



THE SKELETON. 



Attachment of Muscles. To five : Adductor obliquus hallucis, Second and 

 Third dorsal, and First plantar interosseous, and a slip from the tendon of the 

 Tibialis posticus. 



The Fourth (Fig. 149) is smaller in size than the preceding ; its tarsal 

 extremity presents a terminal quadrilateral surface, for articulation Avith the 

 cuboid ; a smooth facet on the inner side, divided by a ridge into an anterior 

 portion for articulation with the third metatarsal, and a posterior 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 extremity, 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 out- 

 ward will indicate the side to which it belongs. 



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

 Fourth dorsal, and Second plantar interosseous, and a slip from the tendon of the 

 Tibialis posticus. 



For third 

 letatarsal. 



For cuboid. f 



For ext. cuneiform. metatarsal. 



FIG. 149. The fourth metatarsal. (Left.) 



For fourth 



luberomty. 

 metatarsal. \ 



For cuboid. 

 FIG. 150. The fifth metatarsal. (Left.) 



The Fifth (Fig. 150) is recognized by the tubercular eminence 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. 



The projection on the outer side of this bone at its tarsal end at once dis- 

 tinguishes 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. 



Articulations. Each bone articulates with the tarsal bones by one extremity, 

 and by the other 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. 



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. 



