272 THE ARriri'LATIOXS 



border of the cuboid on its dorsal aspect, passing over the posterior external angle 

 of the external cuneiform l)one. It is wider externally. 



The plantar cubo-scaphoid ligament is a well-marked strong band, which runs 

 forwards and outwards. h\)\\i the phuitar surface of the scaphoid to the depression 

 on the inner surface of the cuV)oid. and slightly into the plantar surface just below it. 



The interosseous cubo-scaphoid ligament is a strong band which passes 

 between the apixiscd sin-faces of these bones from the dorsal to the plantar ligaments. 

 Some of its })osterior til)res reach the plantar surface of the foot behind the cubo- 

 scaphoitl ligament, and radiate outwards and backwards over the inner border of 

 the cuboid to blend with the anterior extremity of the short calcaneo-cuboid 

 ligament. 



(ii) Tlie Scapho-cuneiform Articulation 



Class. — D'mrthro^h. Subdivision. — ArtJirodia. 



The ligaments uniting the scaphoid with the three cuneiform bones are: — 



Dorsal. Plantar. 



Internal. 



The dorsal scapho-cuneiform ligament is ver}' strong, and stretches as a con- 

 tinuous structure on the dorsal surface of the scaphoid, between the tubercle of the 

 scaphoid on the inner side, and the dorsal cubo-scaphoid ligament externalh", passing 

 forwards and a little outwards to the dorsal surfaces of the three cuneiform bones. 



The internal scapho-cuneiform ligament is a very strong thick band which 

 connects the tubercle of the scaphoid with the inner surface of the internal cunei- 

 form bone. It is continuous with the dorsal and plantar ligaments. Its lower 

 border touches the tendon of the tibialis 2yosticus. 



The plantar scapho-cuneiform ligament forms, like the dorsal, a continuous 

 structure extending between the plantar surfaces of the bones. Its fibres pass 

 forwards and outwards. It is in relation below with the tendon of the tibialis 

 'posticus. 



It must be uotieed that tlie expanded tendon of insertion of the tihi'ah's posticus, and the 

 hgaments uniting tlie scaphoid -with the cuboid and cuneiform bones pass forwards and outwards, 

 while tlie peroneus hmgus tendon and the ligaments uniting the first and second rows of bones, 

 except the inner half of tlie dorsal astragalo-scaphoid ligaments, pass fonvardsand inwards. This 

 arrangement is admirably adapted to presen'e the arches of the foot, and especially the transverse 

 arch. Had these tendons and ligaments run directly fuiwarrh all the strain on the transverse arch 

 would liave fallen on the interosseous ligaments, but as it is, the arch is braced up by the above- 

 mentioned stractures. 



(iii) TJic Intercuneiform and (iv) The Cubo-runeifomi Articulations 



Class. — Diarthrosis. Subdivision. — A rthrodia. 



The uniting ligaments of these bones are divided into three sets: 



Dorsal. Plantar. 



Interosseous. 



The dorsal ligaments are three in number, two connecting the three cunei- 

 form liones, and a third uniting the external cuneiform with the cuboid. They 

 pass between the contiguous margins of the bones, and are blended behind with the 

 dorsal ligaments of tlie cubo-scaphoid and scapho-cuneiform joints. 



The plantar ligaments are two in number: a very strong one passes outwards 

 and forwards from the outer side of the base of the internal cuneiform to the apex 

 of the middle cuneiform, winding somewhat to its outer side. The second connects 

 the apex of the external cuneiform with the anterior half of the inner surface 

 of the cuboid along its plantar border, joining Avith the plantar scajiho-cuboid 

 ligament liehind. 



The interosseous ligaments are three in number. They are strong and deep 



