310 



ARTICULATIONS. 



3. ARTICULATIONS OF THE Two Rows OF THE TARSUS WITH EACH OTHER. 



These may be conveniently divided into three sets : The joint between the 

 os calcis and the cuboid. The ligaments connecting the os calcis with the sca- 

 phoid. The joint between the astragalus and the scaphoid. 



The ligaments connecting the os calcis with the cuboid are four in number: 



j Superior Calcaneo-cuboid. 

 | Internal Calcaneo-cuboid (Interosseous). 

 Long Calcaneo-cuboid. 



Dorsal. 



Plantar. 



Short Calcaneo-cuboid. 



Fig. 212. Ligaments of Plantar Surface of 

 the Foot. 



The Superior Calcaneo-cuboid Ligament (Fig. 211) is a thin and narrow fasci- 

 culus which passes between the contigu- 

 ous surfaces of the os calcis and cuboid, 

 on the dorsal surface of the joint. 



The Internal Calcaneo-cuboid (Interos- 

 seous) Ligament {Fig. 211) is a short, but 

 thick and strong, band of fibres, arising 

 from the Os calcis, in the deep groove 

 which intervenes between it and the 

 astragalus; and closely blended, at its 

 origin, with the superior calcaneo-sca- 

 phoid ligament. It is inserted into the 

 inner side of the cuboid bone. This liga- 

 ment forms one of the chief bonds of union 

 between the first and second row of the 

 tarsus. 



The Long Calcaneo-culoid (Fig. 212), 

 the more superficial of the two plantar 

 ligaments, is the longest of all the liga- 

 ments of the tarsus ; it is attached to the 

 under surface of the os calcis, from near 

 the tuberosities, as far forwards as the 

 anterior tubercle; its fibres pass fonvurds 

 to.be attached to the ridge on the under 

 surface of the cuboid bone, the more su- 

 perficial fibres being continued onwards 

 to the bases of the second, third, and 

 fourth metatarsal bones. This ligament 

 crosses the groove on the under surface 

 of the cuboid bone, converting it into a 

 canal for the passage of the tendon of the 

 l^eroneus Longus. 



The Short Calcaneo-cuboid Ligament lies 

 nearer to the bones than the preceding, 

 from which it is separated by a little 

 areolar adipose tissue. It is exceedingly 



broad, about an inch in length, and extends from the tubercle and the depres- 

 sion in front of it on the fore part of the under surface of the os calcis, to the 

 inl'-rior surface of the cuboid bone behind the peroneal groove. A separate 

 synovial membrane is found in the calcaneo-cuboid articulation. 



The liniments connecting the os calcis with tho sr,:iplu>id are two in number: 



Superior Calcaneo-scaphoid. Inferior Calcaneo-scaphoid. 



The Superior Oafameo*opb<rid (Fig. 211) arises, as already mentioned, with 

 tin- internal calcaneo-cuboid in the deep groove between the astragalus and os 

 calcis ; it passes forward from the inner side of the anterior extremity of the os 



