THE BONES OF THE LOWER LIMB 



207 



presents a concave triangular facet for the middle cimeiform. On 

 the inner side, close to the dorsal aspect, there is a small facet for 

 the internal cimeiform, and sometimes there is an additional facet, 

 below and in front of this, for the first metatarsal. The outer side 

 presents two facets, dorsal and plantar, separated by a rough antero- 

 posterior groove, each of these being subdivided by a vertical 

 ridge into two semi-oval facets. There are thus four facets in all — 



Dorsal Tabercl< 

 Plantar Depressionr' 



External Surface— 



Medullary Foramen—-- • 



For 3rd Metatarsal-' 



Internal Smface 



.. For ist Metatarsal (inconstant) 

 - For Internal Cuneiform 



For External Cuneiform For Middle Cuneiform 



Fig 158. — The Second Right Metatarsal Bone. 

 A, Extemkl View ; B, Internal View. 



a posterior pair for the inner side of the external cimeiform, and an 

 anterior pair for the inner side of the base of the third metatarsal. 

 The plantar surface of the base gives insertion to a slip of the 

 tendon of the tibialis posticus, and origin to a portion of the adductor 

 obliquus hallucis. The shaft gives partial origin to the first and 

 second dorsal interossei. 



Articulations. — Posteriorly with the middle cuneiform, internally 

 with the internal cuneiform, and sometimes with the first 

 metatarsal, externally with the external cuneiform and third 

 metatarsal, and anteriorly with the first phalanx of the second 

 toe. 



Third Metatarsal Bone. — ^This supports the third toe. The base 

 resembles in shape that of the second, the broad end being upwards. 

 Posteriorly it presents a triangular facet, concavo-convex from 

 above downwards, for the external cuneiform. The iimer side of 



