PELVIC LIMBS 



757 



FIG. 571. 



and at right angles to the dorsal margin ; the plantar margin is not 

 distinct from the plantar surface. The dorso-tibial surface is convex 

 from the dorsal to the plantar aspect of the foot, 

 and slightly concave from the heel to the toe, and 

 affords insertion for the tibialis posticus muscle. 



The plantar surface (Fig. 587) is limited on 

 the tibial side by the dorso-tibial surface, and 

 on the fibular side by a distinct margin which 

 separates it from the fibular surface. It is wider 

 at the proximal end than at the distal, and is 

 really but a continuation of the dorso-tibial sur- 

 face on the sole of the foot. It is rough for the 

 attachment of ligaments, whereof one passes to 

 the ectocuneiform and prevents the mesocunei- 

 form from appearing on the plantar aspect of the 

 foot. 



The distal surface is sharply defined. It is 

 kidney-shaped, narrower above than below ; the 

 longer side is on the dorso-tibial border, and the 

 long axis runs obliquely from the dorsal to the 

 plantar side. It is slightly concave, and articu- 

 lates with the base of the rudimentary first meta- 

 tarsal. 



The proximal surface (Fig. 583) is small and 

 oval, and its greater diameter is vertical. It is 

 slightly cup-shaped, and faces as much to the 

 fibular and dorsal sides of the foot as to the heel. 

 It articulates with an oval facet on the tibial 

 margin of 'the distal surface of the scaphoid. 



The fibular surface (Fig. 572) presents a distal and a proximal 

 half. 



The distal half has nearly straight and parallel dorsal and plantar 

 borders, which are at right angles to a straight distal border. It is 

 rough and depressed, and connected by strong ligaments to the tibial 

 side of the second metatarsal. 



The proximal half appears to be bent away from the long axis, 

 and is directed to the sole of the foot. Its dorsal part is depressed ; 

 the plantar part is prominent, and bears a small facet more or less 



POSITION OF ENTOCUNEI- 

 FORM. 



