Uberon definition : A proximal tarsal bone resulting from fusion of intermedium and fibulare.;
Uberon related term : os trigonum; major ankle bone; astragaloid bone; os tarsi tibiale; astragalus bone; astragalus;
Uberon Taxon note : The talus is apparently derived from the fusion of three separate bones in the feet
of primitive amphibians; the tibiale, articulating with tibia, the intermedium, between
the bases of the tibia and fibula, and the fourth centrale, lying in the mid-part
of the tarsus. These bones are still partially separate in modern amphibians, which
therefore do not have a true talus. The talus forms a considerably more flexible joint
in mammals than it does in reptiles. This reaches its greatest extent in artiodactyls,
where the distal surface of the bone has a smooth keel to allow greater freedom of
movement of the foot, and thus increase running speed;