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Fig. 4. Innervation of neuroepithelial cells of the gill filaments in zebrafish
larvae first appeared at 5 d.p.f. (A) Confocal image of an isolated gill from
a 5 d.p.f. larva giving rise to four adjacent developing filaments (f).
Serotonin (5-HT)-immunoreactive (IR) neuroepithelial cells (NECs, arrows) are
shown in green and were present in gill filaments. 5-HT-IR NECs of the gill
arch (ga) were also present. Scale bar, 10 µm. (B) Image in A shown with
zn-12-IR. A zn-12-IR nerve fibre (arrowhead) is seen emanating from a nerve
bundle (nb) of the gill arch in the direction of developing filaments but does
not appear to make contact with filament NECs. In addition, 5-HT-IR NECs of
the gill arch are shown associated with zn-12-IR nerve fibres. A zn-12-IR
neuron (n) is also visible. (C) A developing gill filament (f) of another 5
d.p.f. larva contained a single 5-HT-IR NEC (green). Scale bar, 10 µm. (D)
Image in C shown with zn-12-IR. Unlike the NECs depicted in A and B, this NEC
was intimately associated with zn-12-IR nerve fibres (arrowheads) that arose
from a nerve bundle (nb) of the gill arch (ga).
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