312 SKELETON. 



astragalus, in front of the rough fossa which is occupied by their 

 interosseous ligament. 



S. The Calcaneo Cuboid articulation, formed by the two 

 bones indicated in the name, is maintained by two ligaments, 

 one above, the other below, and by a synovial membrane. 



The Superior Calcaneo Cuboid Ligament arises from the up- 

 per anterior surface of the os calcis, and is inserted into the 

 adjoining upper surface of the cuboides. It is broad, thin, and 

 quadrilateral, with short parallel fibres, and is in contact, above, 

 with the peroneus tertius tendon. 



The Inferior Calcaneo Cuboid Ligament, (Lig. Plantare,) 

 placed on the plantar surface of the foot, is remarkable for its 

 size and extent. It consists of two horizontal planes of fibres, 

 of which the superficial is the longest. The latter arises from 

 the back under surface of the os calcis, and, advancing for- 

 wards, its fibres are inserted into the summit of the ridge which 

 traverses the cuboides obliquely; the greater part of them, how- 

 ever, go beyond this point, and, dividing into fasciculi, are in- 

 serted into the base of the fourth and fifth metatarsal bones. 

 The tendon of the peroneus longus is confined between these 

 fasciculi and the under surface of the cuboides. The other 

 plane of this ligament being more deeply seated, is also shorter. 

 It arises from the front under surface of the os calcis, where 

 the tuberosity exists at this point, and, by advancing, is inserted 

 entirely into the oblique ridge of the euboides. 



The Synovial Membrane being reflected over the articular 

 surfaces of the bones, and lining the ligaments, is uncovered at 

 several places above, where interstices exist between the fibres 

 of the superior ligament, and externally it is contiguous to the 

 tendon of the peroneus longus. 



4. The Scaphoid and the Cuboid bones touch at the external 

 posterior angle of the cuneiforme externum, and form, there, 

 occasionally, a distinct articular surface, with a synovial mem- 

 brane. Besides this mode of union, an interosseous ligament 



