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Fig. 1. Outline of glial development in the pupal wing. (A) Adult wing schematic
drawing indicating the position of neurones belonging to gliogenic (squares)
and non-gliogenic (triangles) sensory organs. L1 and L3 indicate L1 and L3
veins, respectively. P, proximal; D, distal. (B,C) Wild-type wings labelled
with glial (anti-Repo, green) and neuronal (anti-22c10, red) markers at 20
hours after puparium formation (APF; B) and at 24 hours APF (C). GSR indicates
the giant sensillum of the radius. L1, L1 nerve; L3, L3 nerve, r, radial
nerve; c, costal nerve. Neurones issued from the two neurogenic (L3.2 and E2,
ACV and E1) and the three gliogenic (L3.3, L3.1, L3.v) sensory organs
(Van De Bor et al., 2000) are
indicated. Brackets include the L3.3-derived Repo-positive cells. On this and
following panels anterior is to the top, distal to the right. (D) Model for
cell division in wing gliogenic sensory organs. SOP, sensory organ precursor;
IIa and IIb, second order precursors; IIIb, third order precursor; To,
tormogen cell; Tr, trichogen cell [also called dome/cap cell in the case of
campaniform sensilla (reviewed by Keil,
1997)]; Th, thecogen cells; n, neurone; GPI, II and III, first,
second and third order glial precursors, respectively; g, glial cells. The
variable number of glial cells is indicated by the dashed lines. Scale bars:
70 µm (B,C).
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