The eye as a replicating and diverging, modular developmental unit

Todd H Oakley

doi:10.1016/j.tree.2003.09.005

The eye as a replicating and diverging, modular developmental unit

Trends in Ecology & Evolution ◽

10.1016/j.tree.2003.09.005 ◽

2003 ◽

Vol 18 (12) ◽

pp. 623-627 ◽

Cited By ~ 34

Author(s):

Todd H Oakley

Keyword(s):

Developmental Unit

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Head morphogenesis in embryonic avian chimeras: evidence for a segmental pattern in the ectoderm corresponding to the neuromeres

Development ◽

10.1242/dev.108.4.543 ◽

1990 ◽

Vol 108 (4) ◽

pp. 543-558 ◽

Cited By ~ 18

Author(s):

G. Couly ◽

N.M. Le Douarin

Keyword(s):

Spatial Distribution ◽

Neural Crest ◽

Developmental Stage ◽

Neural Tube ◽

Neural Crest Cells ◽

Chick Embryos ◽

Quail Embryo ◽

Branchial Arches ◽

Developmental Unit

Areas of the superficial cephalic ectoderm, including or excluding the neural fold at the same level, were surgically removed from 3-somite chick embryos and replaced by their counterparts excised from a quail embryo at the same developmental stage. Strips of ectoderm corresponding to the presumptive branchial arches were delineated, thus defining anteroposterior ‘segments’ (designated here as ‘ectomeres’) that coincided with the spatial distribution of neural crest cells arising from the adjacent levels of the neural fold. This discrete ectodermal metamerisation parallels the segmentation of the hindbrain into rhombomeres. It seems, therefore, that not only is the neural crest patterned according to its rhombomeric origin but that the superficial ectoderm covering the branchial arches may be part of a larger developmental unit that includes the entire neurectoderm, i.e., the neural tube and the neural crest.

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