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Fig. 1. Transplantation design for this study. Medial or lateral halves of
newly-formed somites or pieces of segmental plate mesoderm from quail embryos
were grafted into pockets cut into chick head mesoderm. Also shown are the
sites of origin within head paraxial mesoderm of extraocular and jaw muscles
discussed in this paper. These foci have been identified by orthotopic
transplantations (Noden, 1986;
Couly et al., 1992) and
retroviral injections (Noden, 2002), and were confirmed in this study. The
lateral rectus and pyramidalis primordia arise medial and ventral to the first
branchial arch progenitors.
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