THE LOWER LIMB 



585 



The plantar ligament passes between the inner aspect of the 

 eminence on the plantar surface of the internal cuneiform and the 

 plantar aspect of the middle cuneiform. 



VII. Cubo-cuneiform Joint. — ^This belongs to the class diarthrosis, 

 and to the subdivision arthrodia. The ligaments are dorsal, plantar, 

 and interosseous. 



The dorsal ligament passes between the dorsal surface of the 

 external cuneiform bone ind the dorsal surface of the cuboid. 



The plantar ligament passes from the plantar aspect of the 

 external cuneiform bone to the internal surface of the cuboid over 

 its anterior half, close to the plantar surface. 



The interosseous ligament, which is strong and deeply placed, 

 passes bet\veen the entire vertical extent of the contiguous surfaces 

 of the two bones in front of the articular facets. 



Synovial Membrane of the Naviculo-cuneiform, Intercuneiform, 

 and Cubo-cuneiform Joints. — The naviculo-cuneiform synovial mem- 

 brane is usually prolonged into the cubo-cuneiform joint, though 



Interosseous Ligament 



Fig. 271. — The SYNO\aAL Cavities of the Tarsal and 

 Tarso-metatarsal Joints. 



occasionally the latter has a synovial sac pecuhar to it. It is also 

 continued into the naviculo-cuboid joint in those cases where these 

 two bones articulate by facets. Further, it sends forwards two 

 prolongations, one on either side of the middle cuneiform. The 

 prolongation between the middle and external cuneiform and that 

 between the external cuneiform and cuboid are entirely shut off 

 from the sjmovial cavity of the middle tarso-metatarsal joint (the 

 joint between the cuneiform bones and the second and third meta- 

 tarsal bones). The explanation of this is that the interosseous 

 hgaments between the middle and external cuneiform and between 

 the external cuneiform and cuboid, which are placed in front of the 

 articular surfaces, are attached over the entire vertical extent of 

 the contiguous surfaces from the dorsal ligaments above to the 

 plantar below. The prolongation, however, between the middle 



