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Figure 1 | Frontiers in Zoology

Figure 1

From: Looking like Limulus? – Retinula axons and visual neuropils of the median and lateral eyes of scorpions

Figure 1

Cobalt fills via median eyes, sagittal sections. A, first median eye visual neuropil posteriorly in dorso-lateral protocerebrum. Note dense arrangement of Cobalt-filled profiles. Arrowheads point to axons extending to arcuate body. Bar 100 μm. B, bifurcation of fibres projecting from first to second median eye neuropil. Arrowheads point to axons extending to arcuate body. Bar 100 μm. C, second median eye visual neuropil under cell body rind, divided by an annulus into posterior and anterior subunit. Bar 100 μm. D, detail of bifurcation, varicosities in anterior subunit of second median eye visual neuropil. Arrowhead points to axons extending to arcuate body. Bar 100 μm. E, detail of second median eye visual neuropil, showing varicosities in both subunits. Arrowhead points to axons extending to arcuate body. Bar 100 μm. F, detail of annulus (arrows). Bar 25 μm. G, combination of five successive sections to demonstrate path of Cobalt-filled axons connecting median eyes with arcuate body via bifurcation seen in B and D. Bar 50 μm. AB, arcuate body; L1, first lateral eye visual neuropil; L2, second lateral eye visual neuropil; M1, first median eye visual neuropil; M2, second median eye visual neuropil.

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