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Fig. 1. Apical constriction and apicobasal cell elongation in the neural
epithelium during neural tube closure. (A) Projection of confocal
optical transverse sections through the anterior neural plate of neurulating
Xenopus embryo. (a') High-magnification view of a neural
epithelial cell from A. (B) A schematic diagram of the section in A,
illustrating the neural epithelial cells (red) and other surrounding tissues
(grey). (b') A schematic diagram of the section in a'.
Cells in hingepoint regions constrict and elongate (arrow), cells in
intermediate regions elongate, but constrict only a little (arrowhead).
(C) Graph illustrating changes in apical constriction (blue; ratio of
apical surface to basal surface measured from cross-sections) and apicobasal
cell elongation (red; cell height in µm) of neuroepithelial cells during
neural tube closure (stages 14-19; n=10 cells per stage). (D)
Schematic illustrating the change in neural epithelial cell shape during
neural tube closure.
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