The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs.

@article{Sullivan2010TheAO,
  title={The asymmetry of the carpal joint and the evolution of wing folding in maniraptoran theropod dinosaurs.},
  author={Corwin Sullivan and David W E Hone and Xing Zhou Xu and Fucheng Zhang},
  journal={Proceedings. Biological sciences},
  year={2010},
  volume={277 1690},
  pages={2027-33}
}
In extant birds, the hand is permanently abducted towards the ulna, and the wrist joint can bend extensively in this direction to fold the wing when not in use. Anatomically, this asymmetric mobility of the wrist results from the wedge-like shape of one carpal bone, the radiale, and from the well-developed convexity of the trochlea at the proximal end of the carpometacarpus. Among the theropod precursors of birds, a strongly convex trochlea is characteristic of Coelurosauria, a clade including… CONTINUE READING
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