AimCTLATION OF THE CUNEIFORM BOXES. 229 



and from their synovial cavity offsets are sent forwards between the 

 cuneiform bones. 



]>ihi'"/t t] navicular and cuboid bones there is an oblique dorsal to the cu- 

 bil of fibres (fig. 87, h) ; a transverse plantar band (fig. 89, d), 

 which is concealed by the tendon of the tibialis posticus ; and a 

 strong iitt' /".->< nut Jiij<ii,i-'-nt. 



When the bones touch, the surfaces are tipped with cartilage, and synovial 

 a process of the naviculo-cuneiform synovial cavity extends between sac> 

 them. 



ARTICULATION OF THE CUNEIFORM BOXES. These bones are Union of the 

 united to one another by cross bands ; and the external one articu- 

 lates with the cuboid after a similar manner. 



The three cuneiform bones are connected together by short trans- one with 

 verse il.,rsal bands (fig. 87, w) between the upper surfaces, and inter- ai 



8 ligaments between the rough parts of the contiguous sides of 

 the bones. Laterally there are articular surfaces between the bones, 



ith offsets of the common synovial cavity. 



Where the external cuneiform touches the cuboid bone, the sur- and with 

 i'ace< are covered with cartilage. A dorsal ligament (fig. 87, TO) bone" 



- transversely between the two ; and a plantar ligament 

 (fig. 89, g) takes a similar direction. Between the bones there is 

 also an iittf.ro**> on* ligament. 



This joint is furnished either with a distinct synovial sac, or with synovial 

 a prolongation of the common synovial cavity. 



The synovial cavity of the articulations of the cuneiform bones is Common 

 common to many of the bones of the tarsus. Placed between the sac U 

 navicular and the three cuneiforms, it sends one prolongation for- 

 wards between the inner and middle cuneiform to the joints with 

 the second and third metatarsal bones, another between the middle 

 and outer cuneiform bones, a third outwards to the articulation of 

 the navicular with the cuboid bone (when present), and sometimes 

 a fourth to the joint between the external cuneiform and the cuboid. 



Articular surfaces. On the navicular are three articular facets, Surfaces of 

 the inner being rounded, and the other two flattened. The three nes ' 

 cuneiforms unite in a shallow elliptical hollow, which is most 

 excavated internally. 



Mortn'r/tt. The cuneiform bones glide up and out on the navicular Motion in 

 in inversion of the foot, and down and in in eversion ; and the inner amfere" 

 one moves more than the others in consequence of the shape of the sion ; 

 articular surfaces, and the attachment to it of the tibialis anticus. 



AY hen the bones pass down the dorsal ligaments are made tight : state of the 

 and as they rise the interosseous bands will keep them united. 



In standing these bones are separated somewhat from each other and Joints in 

 with diminution of the arch of the foot, and stretching of the trans- 

 verse ligaments which connect them. 



ARTICULATION OF THE METATARSAL BONES. The bases of the four J^ 1 ^ 

 outer metatarsal bones are connected together by dorsal, plantar, tarsus by 

 and interosseous ligaments ; and where their lateral parts touch, 

 they are covered with cartilage, and have offsets of a synovial sac. 



The dorsal ligaments (fig. 90) are small transverse bands from dorsal, 



