70 HUMAN ANATOMY. 



It articulates with four bones astragalus and three cunei- 

 forms. 



The cuneiform bones are named from their position the in- 

 ternal, middle, and external. 



THE INTERNAL CUNEIFORM, the largest, has its base below, 

 and articulates anteriorly with first metatarsal, posteriorly with 

 scaphoid, and externally with second metatarsal and middle 

 cuneiform. The plantar surface presents tuberosity for insertion 

 of part of tibialis posticus and anticus tendons, the only muscular 

 attachments. It articulates with four bones scaphoid, middle 

 cuneiform, first and second metatarsals. 



THE MIDDLE CUNEIFORM, the smallest, has its base upward, 

 and articulates posteriorly with scaphoid, anteriorly by a tri- 

 angular facet with second metatarsal, and laterally with internal 

 and external cuneiforms. It has no muscles attached. 



THE EXTERNAL CUNEIFORM, intermediate in size, and more 

 regular, articulates posteriorly with scaphoid, anteriorly with 

 third metatarsal, internally with middle cuneiform and second 

 metatarsal, and externally with cuboid and fourth metatarsal. 



Muscular attachments are for flexor brevis pollicis and 

 tibialis posticus. 



THE METATARSAL BONES have the same general form as the 

 metacarpal bones of hand, each consisting of shaft, head, and 

 base. 



The shaft is prismoid and curved, with concavity below, con- 

 vexity above. 



The head is rounded for articulation with phalanges, and has 

 tubercles laterally for ligaments and a groove below for tendon 

 of long flexor. 



The base is wedge-shaped for articulation with the tarsus 

 and with each other. 



The first and strongest articulates at base with internal 

 cuneiform, at head with phalanx and second metatarsal, and has 

 three muscular attachments for tibialis anticus, peroneus lon- 

 gus, and first dorsal interosseous. 



The second is wedged in by base between three cuneiform 

 bones, articulates with second phalanx, first and third metatarsi, 

 and has three muscular attachments for adductor pollicis, first 

 and second interosseous. 



The third articulates with external cuneiform below and sec- 

 ond and third metatarsi and third phalanx, and has four muscu- 

 lar attachments for adductor pollicis, first plantar, and second 

 and third dorsal interossei. ^ 



The fourth articulates at base with external cuneiform and 

 cuboid and at extremity with third and fifth metatarsal and 



