part of part of preaxialmost part of in taxon has developmental contribution from has developmental contribution from Aves manual digit manus manual digit 2 mesenchyme manual digit 1 mesenchyme alular digit UBERON:0012260 wing digit I wing digit 2 (embryonic) digit I of manus wing digit 1 (adult) A manual digit found in Aves that is the most preaxial position and is morphologically similar to digit 1 in the standard tetrapod configuration and develops from embryonic digit 2, with contributions from embryonic digit 1. digit I(CII) of manus Hypothesized to be homologous to manual digit 1 of other tetrapods. Develops from the embryonic digit that is positionally the 2nd, with contributions from the 1st alula (Aves) alula alular digit plus metapodial segment