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The Development and Homology of the Chelonian Carpus and Tarsus by Ann C. Burke; Pere Alberch is a Environmental Science article available to read on EtoBox.

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The long-standing controversies involving the number and homologies of the elements of the carpus and tarsus of turtles are reviewed from a developmental perspective. The analysis is based on a detailed description of the chondrogenesis of the carpus and tarsus in the species Chelydra serpentina and Chrysemys picta. The first stage described is the differentiation of a Y-shaped chondrogenetic condensation involving the humerus (femur)-radius/ ulna (tibia/fibula). This stage is followed by the early formation of a series of connected condensations off the distal end of the postaxial element (ulna or fibula). This linear array, which we refer to as the primary axis, comprises the ulnare-distal carpal 4-metacarpal 4 in the carpus and the fibulare-distal tarsal 4-metatarsal 4 in the tarsus. There are two precondensations that branch off the primary axis. The proximal one will soon form the intermedium while the distal one will generate a digital arch that will give rise sequentially to digits 3-2-1, in this order. Digit 5 is not part of the digital arch and forms as an independent condensation. We emphasize that chondrogenetic foci often form as "branches" off existing condensations. T

Who reads The Development and Homology of the Chelonian Carpus and Tarsus?

Author

Ann C. Burke; Pere Alberch

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

1985

Language

EN

Field

Environmental Science (Physical Sciences)