268 



A MANUAL OF ANATOMY 



the base presents two semi-oval facets, dorsal and plantar, separ- 

 ated by a rough antero-posterior groove, for the anterior pair of 

 facets on the outer side of the base of the second metatarsal. On 

 the outer side there is a large semi-oval facet, dorsally placed, 

 for the inner side of the base of the fourth 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 



External Surface 



Medullary Foramen- 



For 4th Metatarsal.. 



-.Internal Surface 



V 



For and Metatarsal 



For External Cuneiform 



Fig. 159. — The Third Right Metatarsal Bone. 

 A. External View ; B, Internal View. 



obliquus hallucis. The shaft gives origin to the first plantar 

 interosseous, and partial origin to the second and third dorsal 

 interossei. 



Articulations. — Posteriorly with the external cuneiform, internally 

 with the second metatarsal, externally with the fourth metatarsal, 

 and anteriorly with the first phalanx of the third toe. 



Fourth Metatarsal Bone. — ^This supports the fourth toe. The 

 base is quadrilateral, and is somewhat broader above than below. 

 Posteriorly it presents a quadrilateral facet for the cuboid. On 

 the inner side there is a large semi-oval facet for the third meta- 

 tarsal, and this is sometimes prolonged to the extremity of the 

 base, thus forming an additional facet for the outer side of the 

 external cuneiform. On the outer side there is a large semi-oval 

 facet, dorsally placed, for the inner side of the base of the fifth 

 metatarsal, and below this there is a deep rough groove. The 

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



