ARTICULATIONS 19 



V. ARTICULATIONS OF THE TARSUS. 



These are arthrodial joints. 



Articulations between the Cakanewn and Astragalus. 



There are two articulations between the calcaneum and the 

 astragalus : a posterior one, peculiar to the two bones, and 

 an anterior one, common to them and the scaphoid bone ; 

 they are separated by the interosseous ligament. 



The external calcaneo-astragaloid ligament passes from 

 outer surface of the astragalus just below the external malle- 

 olus, to the outer surface of the os calcis. 



The posterior calcaneo-astragaloid ligament connects the 

 posterior parts of the two bones. 



The interosseous ligament consists of a strong thick band 

 passing from the groove between the articulating surfaces of 

 the astragalus to a corresponding groove on the os calcis. 



Articulation between Calcaneum and Scaphoid. 



The superior calcaneo-scaphoid ligament arises from the 

 groove between the astragalus and os calcis, being blended 

 here with the internal calcaneo-cuboid ligament, and passes 

 upwards and inwards to the outer side of the scaphoid bone. 



The inferior calcaneo-scaphoid is a broad strong band 

 passing from the anterior and inner end of the sustentaculum 

 tali of the os calcis to the hollow on the under surface of 

 the scaphoid bone. It supports the head of the astragalus, 

 and its plantar surface is in contact with the tendon of the 

 tibialis posticus. 



_ Articulation between the astragalus and scaphoid. The only 

 ligament is 



The superior astragalo-scaphoid, passing from the neck of 

 the astragalus to the upper surface of the scaphoid bone. 



Articulations between the Scaphoid, Cuboid, and Three Cuneiform 

 Bones are connected by the following ligaments : 



Dorsal ligaments, which pass from one bone to the other. 



Plantar ligaments, similarly arranged upon the sole. 



Interosseous ligaments (4), strong fibres passing between 

 the rough non-articulating surfaces of the bones. 



Articulation between Calcaneum and Cuboid. 



The superior calcaneo-cuboid ligament passes between the 

 dorsal surfaces of the os calcis and cuboid bones. 



The internal calcaneo-cuboid or interosseous ligament 

 attached to a deep groove on the os calcis between it and the 

 astragalus, here blending with the superior calcaneo-scaphoid 

 ligament, and passing to the inner side of the cuboid bone. 



The Inferior ligaments are two : 



The long calcaneo-cuboid (long plantar) ligament, attached 



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