DISSECTION OP THE POSTERIOR LIMB. 91 



of the facets by which these bones come into contact. In addition, it 

 descends between the cuboid and scaphoid bones, to form a prolongation 

 for the anterior cuboido-scaphoid arthrodia." — Ohanivmu. 



Ligaments imiting the Os Calcis and Astragalus. — There are four of 

 thete — a superior, two lateral, and an interosseous. The first of them is 

 composed of fibres passing between the two bones above their surfaces 

 of contact ; the lateral ligaments pass between them on each side ; while 

 the interosseous ligament cannot be seen in its entirety, as it passes 

 between the rough impressions on the surfaces of apposition of the 

 bones, and^must be cut before these can be separated. 



Directions. — Attention should next be turned to the following liga- 

 ments, which bind together the other four tarsal bones. 



The Anterior Cuboido-scapkoid Ligament is of small size, and passes 

 between the two bones from which it is named, above the entrance to 

 the canal by which the perforating metatarsal artery passes through the 

 hock. The same bones are joined by an interosseous ligament, which 

 forms the roof of that canal. 



The Anterior Cuboido-cunea7i Ligament connects the cuboid and 

 cuneiform magnum bones below the entrance to the above-mentioned 

 vascular canal ; and an interosseous cuboido-cunean ligament forms the 

 floor of the canal. 



The Scaphoido-cunean Interosseous Ligament joins the scaphoid and 

 two cuneiform bones. 



The Intercunean Ligament passes between the two cuneiforms. 



These and the other interosseous ligaments are concealed in the 

 interstices between the different bones which they bind together, and 

 cannot be fully seen until the bones are separated. 



Synovial Membranes. — "There is a proper synovial membrane for the 

 facets by which the scaphoid and cuneiform magnum bones correspond ; 

 this synovial membrane belongs also to the two cuboido-scaphoid, and 

 posterior cuboido-cunean arthrodiee. The anterior cuboido-scaphoid 

 diarthrosis receives a prolongation from the synovial membrane between 

 the OS calcis and astragalus on the one hand, and the cuboid and 

 scaphoid on the other. The play of the anterior cuboido-cunean, and 

 inter-cunean facets is facilitated by two prolongations of the tarso- 

 metatarsal synovial membrane." — Chauveau. 



THE TARSO-METATARSAL ARTICULATION. 



An Interosseous Ligament binds the heads of the metatarsal bones to 

 the tarsal bones with which these articulate, and the union is further 

 secured by many of the ligaments, already dissected, which, though 

 they belong to the hock, have points of insertion into the heads of the 

 metatarsal bones. 



