778 MAMMALIAN ANATOMY 



The proximal rim of the concave plantar surface (Fig. 601) is 

 swollen for ligamentous attachment. 



Determination. The fourth metatarsal is recognized by the 

 tubercle on the tibial side of the base. When the bone is held with 

 the base uppermost and with the plantar side in front, the straight side 

 of the proximal surface is on .the side to which the bone belongs. 



FIG. 601. 

 Proximal End. 



With Cuboid. 



Fibular Side. MWifw Tibial Side. 



FOURTH LEFT METATARSAL, PLANTAR SURFACE OF BASE AND 



PART OF SHAFT. 



Muscular Attachments. To the fibular side of the base is 

 attached a slip from the tendon of the peroneus longus ; on the plantar 

 aspect is the area of the origin of the third plantar interosseous. The 

 fourth dorsal interosseous muscle arises from the fibular side of the 



shaft. 



THE FIFTH METATARSAL BONE. 



General Description. The Fifth Metatarsal has a prismatic 

 Base, which is compressed in an oblique direction from the dorso-tibial 

 side to the fibulo-plantar side. The fibular angle is prolonged into a 

 large, pointed tuberosity for ligamentous and muscular attachment. 



The triangular proximal surface (Fig. 598) is continued upon this 

 tuberosity as its tibial surface, which joins the fibular side of the cuboid 

 and forms with it the peroneal canal. Distal to the tuberosity is a 

 crescentic articular facet for the distal end of the fibular side of the 

 cuboid. 



The tibial surface (Fig. 602) lies almost in the same plane as the 

 proximal, facing to the dorsal and tibial sides. It exhibits on its 

 dorsal half a bi-convex articular facet, separated by a median groove 

 from a long facet on the plantar rim. The facets articulate with facets 

 on the fibular side of the fourth metatarsal, and the groove serves for 

 ligamentous attachment. 



The dorsal surface (Fig. 603) is narrow and pointed above ; its 



