334 INFERIOR EXTREMITY 



The long plantar ligament, therefore, extends over the greater 

 part of the plantar aspect of the lateral portion of the tarsus, 

 and is the longest of the tarsal ligaments. Further, it forms 

 the greater part of the sheath of the tendon of the peronaeus 

 longus. 



The Plantar Calcaneo-cuboid Ligament (O.T. Short Plantar 

 Ligament) is placed under cover of the long plantar ligament. 

 Slip the knife between them and carry the cutting edge 

 backwards so as to detach the long plantar from the distal 

 surface of the calcaneus. On throwing the detached band 

 forwards the plantar calcaneo-cuboid ligament comes into 

 view and little dissection is required to make its connections 

 apparent. It is composed of short, strong fibres, not more 

 than an inch in length. They spring from the small tubercle 

 on the anterior part of the distal surface of the calcaneus, 

 and are attached, anteriorly, to the distal surface of the cuboid, 

 posterior to its tuberosity. The ligament is broader than the 

 long plantar ligament and is apparent along the medial 

 border of the latter before it is reflected. 



In the maintenance of the longitudinal arch of the foot, 

 the long plantar ligament and the plantar calcaneo-cuboid 

 ligament have an importance which is surpassed only by that 

 of the plantar calcaneo-navicular ligament. 



The joint between the talus and the navicular and that between the 

 calcaneus and the cuboid 'are frequently referred to together as the trans- 

 verse tarsal joint. It is here that the movements of eversion and inversion 

 of the foot chiefly take place, and it should be noted that all the ligaments 

 which connect together the anterior and the posterior segments of the 

 tarsus at this joint, except one, are attached posteriorly to the calcaneus. 

 They are : 



Plantar calcaneo-navicular, "i 



Lateral calcaneo-navicular, I 



Long plantar, V Attached to the calcaneus. 



Plantar calcaneo-cuboid, 



Calcaneo-cuboid capsule, J 



Dorsal talo-navicular, } Attached to the talus. 



Inter - cuneiform Articulations. The three cuneiform 

 bones are held together so firmly that very little individual 

 movement is permitted. The chief uniting structures are 

 two strong interosseous ligaments which pass between the non- 

 articular portions of their opposed surfaces. These can only 

 be seen when the bones are separated from each other. 

 Dorsal inter-cuneiform ligaments are also present. These are 

 short, flat, transversely-placed bands. 



