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Fig. 7. Cell fate and movements at the caudal end of the E8.5 embryo.
Tissues are colour-coded as follows: blue, neurectoderm (flattened so that the
dorsal neural tube lies laterally); brown, notochord; pink, paraxial mesoderm;
white fill and orange arrow, lateral mesoderm; purple, primitive streak. The
checked area contains progenitors of chordoneural hinge (CNH) cells and neural
progenitors retained in the tail bud at E10.5. Notice the region overlap.
Arrows represent the movement of cells and are colour-coded as follows: blue,
neurectoderm; brown, axial mesoderm; red, paraxial mesoderm; orange, lateral
mesoderm. Broken arrows, movements of progenitor cells inside the progenitor
zone. As well as a net movement rostrally to neural tube from the progenitor
zone, lateral progenitors can move towards the midline (blue broken arrows),
form mesoderm (purple arrows) and move towards presomitic mesoderm (red
arrows). Cells at the midline exit to presomitic mesoderm, and might join a
pre-existing stream of presomitic mesoderm. In the border (junction of
checked, purple and brown regions), cells exit to ventral neurectoderm,
notochord and medial somites (thin red arrow). They might also exit caudally
to the primitive streak (purple arrow). Box enclosed by a broken line
indicates the most recently formed somite.
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