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Re: Upstroke of *Archaeopteryx* and *Confuciusornis* was Re: Science feather strength debate
2010/11/2 David Marjanovic <email@example.com>:
> In extant birds, the pectoralis muscles, which
> accomplish the downstroke, do _not_ attach to the keel except at its very
> base, they attach to the huge plate that forms the rest of the sternum; the
> keel is where the supracoracoideus muscles attach, and they do the upstroke.
Part of the M. pectoralis is located superficially to the M.
supracoracoideus and inserts on the keel near its border.