Fig. 5
From: Also looking like Limulus? – retinula axons and visual neuropils of Amblypygi (whip spiders)
General anatomy of visual neuropils and protocerebrum in Amblypygi, frontal sections. Heterophrynus elaphus; Wigglesworth stains. a-c, Three sections from dorsal (a), central (b) and more ventral (c) part of the protocerebrum showing large-scale spread of the mushroom bodies, especially of the mushroom body lobes. Note the relatively small arcuate body. Bars 250 μm. d, e, Detail of the first and second median eye visual neuropil. Bars 50 μm. f, g, Detail of the first and second lateral eye visual neuropil. Note subdivision of the second visual neuropil into three subunits. Bars 100 μm. AB, arcuate body; MBC, mushroom body calyces; MBL, mushroom body lobes; M1, first median eye visual neuropil; M2, second median eye visual neuropil; L1, first lateral eye neuropil; L2, second lateral eye neuropil; arrow, tract connecting M1 and M2; a-c subunits of L2; arrowhead tract connecting L1 and L2