356 



THE AKTICULATIONS OE JOINTS. 



become continuous with the tibio-navicular portion of the deltoid ligament of 

 the ankle-joint. The plantar aspect of this ligament is in contact with the tendon 

 of the tibialis posterior muscle, through which the head of the talus receives great 

 support. Superiorly it contributes an articular surface which forms a triangular 

 portion of the floor of the composite socket in which the head of the talus is 

 received. 



(&) The calcaneo-navicular part of the bifurcate ligament (Fig. 325) lies deeply in 

 the front part of the sinus tarsi, i.e. the interval between the talus and calcaneus. 

 Its fibres are short, and extend from the dorsal surface of the front part of the 



Tendon of insertion of 

 peronseus longus muscle 



Base of metatarsal bone of 

 hallux 



Plantar inter-metatarsal __ 

 ligaments 



Plantar cuboid ridge 

 Plantar cubo-cuneiform ligament 



Plantar calcaneo-cuboid ligament 



Tendon of peroneus longus muscle 

 Long plantar ligament 



Tendon of insertion of 

 tibialis anterior muscle 



First cuneiform bone 



Plantar naviculo-cuneiform 

 ligament 



Tendon of tibialis posterior 



muscle 



Groove for tendon of tibialis 



posterior muscle 



Plantar calcaneo-navicular 

 ligament 



Deltoid ligament of ankle 



\ Medial malleolus 



Groove for tendon of flexor hallucis 

 longus muscle 

 Calcaneus 



FIG. 326. PLANTAR ASPECT OF TARSAL AND TARSO-METATARSAL JOINTS. 



calcaneus, immediately to the lateral side of the sustentacular facet, forwards to 

 the lateral side of the navicular bone. Frequently the ligament presents a surface 

 which articulates with the head of the talus, and in these cases it forms a part of 

 the composite socket. 



The cavity of the talo-calcaneo-navicular joint is closed posteriorly by the 

 interosseous talo-calcaneal ligament already described. On its medial and lateral 

 inferior aspects it is closed by the calcaneo-navicular ligaments. 



The superior and lateral aspects are covered by the ligamentum talonaviculare 

 dorsale. This ligament is thin, and extends from the proximal non-articular area 

 on the head of the talus to the dorsal surface of the navicular bone. It may be 

 subdivided into dorsal, lateral, and medial talo-navicular bands (Fig. 324), which, 

 with the calcaneo-navicular and interosseous talo-calcaneal ligaments, complete 

 the capsular investment of the joint. 



