354 



navicular ligament. There are two ligaments in this joint: the articular capsule 

 and the dorsal talonavicular. 



The Articular Capsule (capsula articularis) . The articular capsule is imperfectly 

 developed except posteriorly, where it is considerably thickened and forms, with 

 a part of the capsule of the talocalcaneal joint, the strong interosseous ligament 

 which fills in the canal formed by the opposing grooves on the calcaneus and talus, 

 as above mentioned. 



The Dorsal Talonavicular Ligament (ligamentum talonaviculare dorsale; superior 

 astragalonavicular ligament} (Fig. 354). This ligament is a broad, thin band, which 

 connects the neck of the talus to the dorsal surface of the navicular bone; it is 

 covered by the Extensor tendons. The plantar calcaneonavicular supplies the 

 place of a plantar ligament for this joint. 



Synovial Membrane. The synovial membrane lines all parts of the capsule of the joint. 



Movements. This articulation permits of a considerable range of gliding movements, and some 

 rotation; its feeble construction allows occasionally of dislocation of the other bones of the tarsus 

 from the talus. 



Calcaneocuboid Articulation (articulatio calcaneocuboidea; articulation of the 

 calcaneus with the cuboid). The ligaments connecting the calcaneus with the 

 cuboid are five in number, viz., the articular capsule, the dorsal calcaneocuboid, 

 part of the bifurcated, the long plantar, and the plantar calcaneocuboid. 



The Articular Capsule (capsula articularis). The articular capsule is an imper- 

 fectly developed investment, containing certain strengthened bands, which form 

 the other ligaments of the joint. 



The Dorsal Calcaneocuboid Ligament (ligamentum calcaneocuboideum dorsale; supe- 

 rior calcaneocuboid ligament) (Fig. 355). The dorsal calcaneocuboid ligament is 

 a thin but broad fasciculus, which passes between the contiguous surfaces of the 

 calcaneus and cuboid, on the dorsal surface of the joint. 



The Bifurcated Ligament (ligamentum bifurcatum; internal calcaneocuboid; inter- 

 osseous ligament) (Fig. 355, 359). The bifurcated ligament is a strong band, 

 attached behind to the deep hollow on the upper surface of the calcaneus and divid- 

 ing in fron.t in a Y-shaped manner into a calcaneocuboid and a calcaneonavicular 

 part. The calcaneocuboid part is fixed to the medial side of the cuboid and forms 

 one of the principal bonds between the first and second rows of the tarsal bones. 

 The calcaneonavicular part is attached to the lateral side of the navicular. 



The Long Plantar Ligament (ligamentum plantare longum; long calcaneocuboid 

 ligament; superficial long plantar ligament) (Fig. 358) . The long plantar ligament 

 is the longest of all the ligaments of the tarsus : it is attached behind to the plantar 

 surface of the calcaneus in front of the tuberosity, and in front to the tuberosity 

 on the plantar surface of the cuboid bone, the more superficial fibers being con- 

 tinued forward to the bases of the second, third, and fourth metatarsal bones. 

 This ligament converts the groove on the plantar surface of the cuboid into a 

 canal for the tendon of the Peronaeus longus. 



The Plantar Calcaneocuboid Ligament (ligamentum calcaneocuboideum plantare; 

 short calcaneocuboid ligament; short plantar ligament) (Fig. 358). The 'plantar 

 calcaneocuboid ligament lies nearer to the bones than the preceding, from which 

 it is separated by a little areolar tissue. It is a short but wide band of great strength, 

 and extends from the tubercle and the depression in front of it, on the forepart 

 of the plantar surface of the calcaneus, to the plantar surface of the cuboid behind 

 the peroneal groove. 



Synovial Membrane. The synovial membrane lines the inner surface of the capsule and is 

 distinct from that of the other tarsal articulations (Fig. 360). 



Movements. The movements permitted between the calcaneus and cuboid are limited to 

 slight gliding. movements of the bones upon each other. 



The transverse tarsal joint is formed by the articulation of the calcaneas with the cuboid, and 



