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Fig. 6. Neural crest cells impart morphological features to skeletal and ectodermal
structures. Sagittal sections of the beaks of control duck (A) and quail (B)
embryos. (C,D) Beak sections of duck-quail chimeras after orthotopic
replacement of quail neural crest (NC) into duck host (`Quck' chimera) (C),
and reciprocal graft of duck NC into quail embryo (`Duail') (D), showing that
the host upper bill morphology is modified according to the species origin of
the NC [reproduced, with permission, from Schneider and Helms
(Schneider and Helms, 2003)].
(E) Chimeric hyoid skeletal structures of a quail at embryonic day (E) 9,
after unilateral replacement by duck NC (Alcian Blue staining). (F) Higher
magnification of the entoglossum: on grafted side, the ipsilateral half has
acquired a duck-shaped morphology [reproduced, with permission, from Tucker
and Lumsden (Tucker and Lumsden,
2004)]. Arrows indicate the proximal limit of the cartilages on
both sides. d, dentary; et, egg tooth; ey, eye; Mk, Meckel's cartilage; nc,
nasal capsule; np, nasal passage; pm, premaxilla; pp, prenasal process; V,
trigeminal sensory neurons.
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