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Figure 3 | Frontiers in Zoology

Figure 3

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

Figure 3

Cobalt fills simultaneously via median and lateral eyes, sagittal sections. A, first median and lateral eye visual neuropils, located posteriorly in lateral protocerebrum. Both neuropils with Cobalt-filled retinula axons. Bar 250 μm. B, second visual neuropils of median and lateral eyes. Besides regions with only Cobalt-filled R-cell axons of median or lateral eyes, encircled region with Cobalt-filled R-cell axons of both median and lateral eyes. Bar 250 μm. C, detail of first median and lateral eye visual neuropils. Note tract through cell body rind projecting to second median eye visual neuropil. First varicosities appear posterior to first lateral eye visual neuropil, indicating second lateral eye visual neuropil. Bar 100 μm. D, detail of second visual neuropils of median and lateral eyes. One can distinguish between lateral and median eye fills, lateral fills brighter. Besides regions with only Cobalt-filled R-cell axons of median or lateral eyes, encircled region with Cobalt-filled R-cell axons of both median and lateral eyes. Bar 100 μm. L1, first lateral eye visual neuropil; L2, second lateral eye visual neuropil; M1, first median eye visual neuropil; M2, second median eye visual neuropil; M/L2, region of L2 or M2 with Cobalt-filled R-cell axons of both median and lateral eyes.

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