274 



THE ARTICULATIOXS 



marked fibrous appoarancc whieli tlie ligament lias in the sole, and becomes 

 smooth and faceted. In contact with the under surface of the ligament the tendon 

 of the tibialis posticu.s passes, giving considerable support to the head of the 

 astragalus by assisting the power and protecting the spring of the ligament. The 

 fibres of the ligament run forwards and inwards. 



The astragalo-scaphoid ligament is a broad, tlnn, l)Ut well-marked layer of 

 fibres which })asses from the dorsal and external surfaces of the neck of the astragalus 

 to the whole length of the dorsal surface of the scaphoid. Many of the fibres con- 

 verge to their insertion on the scaphoid. The fibres low down on the outer side 



Fig. 2.56. — View of the Foot froiM above, with the Astragalus removed to show the 

 Inferior and External Calcaneo-scaphoid Ligaments. 



Dorsal cubo-scaphoid 

 ligament 



Dorsal caleaneo-cuboid 



ligament 



Internal ealcaneo-cuboid 



ligament 



External calcaneo-scaphoid 



ligament 



Cut edge of interosseous 

 ligament 



— Inferior calcaneo-scaphoid 

 ligament 



Tendon of tibialis posticus 



blend a little way from their origin with the upper edge of the external calcaneo- 

 scaphoid ligament, and then pass forwards and inwards to the scaphoid; those next 

 above pass obli(]uely and with a distinct twist over the upper and outer side of the 

 head of the astragalus to the centre of the dorsum of the scaphoid, overlapping 

 fibres from the inner side of the astragalus as well as some from the anterior liga- 

 ment of the ankle-joint. 



Synovial membrane. — The astragalo-scaphoid is lined by the same synovial 

 membrane as the anterior calcaneo-astragaloid joint. 



(ii) The Calcaneo-cnhoid Articulation 

 Class. — Dinrthrosis. Subdivision. — Saddle-shaped Arthrndia. 



The ligaments wliidi unite the bones forming the outer part of tlie niedio-tarsal 

 joint are: — 



Internal or interosseous calcaneo-cul^oid. 

 Long inferior caleaneo-cuboid. 



Dorsal calcaneo-cul)oid. 

 Short inferior caleaneo-cuboid. 



The internal or interosseous caleaneo-cuboid ligament (fig. 256) is a strong 

 band of fibres attached to the os eakis along the inner part of the non-articular 



