Due to the presence of the radius in Tetrpodomorph fish this element is not inherently linked to the presence of digits or flexor musculature. The corresponding bone in the posterior fin/limb is the tibia.[Phenoscape]. In four-legged animals, the radius is the main load-bearing bone of the lower forelimb. Its structure is similar in most terrestrial tetrapods, but it may be fused with the ulna in some mammals (such as horses) and reduced or modified in animals with flippers or vestigial forelimbs [ISBN:0-03-910284-X]

Due to the presence of the radius in Tetrpodomorph fish this element is not inherently linked to the presence of digits or flexor musculature. The corresponding bone in the posterior fin/limb is the tibia.[Phenoscape]. In four-legged animals, the radius is the main load-bearing bone of the lower forelimb. Its structure is similar in most terrestrial tetrapods, but it may be fused with the ulna in some mammals (such as horses) and reduced or modified in animals with flippers or vestigial forelimbs [ISBN:0-03-910284-X]

CALOHA:TS-2199

MESH:D011884

VSAO:0005012

galen:Radius

FMA:23463

GAID:185

AAO:0000788

SCTID:181940002

MA:0001357

EMAPA:19103

Wikipedia:Radius_(bone)

UMLS:C0034627

NCIT:C12777

The major preaxial endochondral bone in the anterior zeugopod[Phenoscape].

UBERON:0001423

radius

uberon

One of the two long bones of endochondral origin of the fore-epipodium; it is located on the lateral side of the ulna. Its upper end articulates with both the humerus and the ulna, whereas the lower articulates with the carpals.[AAO]

UBERON:0001423

radius bone