Fig. 2
From: The visual system of harvestmen (Opiliones, Arachnida, Chelicerata) – a re-examination
Cobalt fills via both eyes of Opilio canestrinii (a-c, sagittal sections, dorsal is up) and Leiobunum spec. (d-g, frontal sections, anterior is up). a eye tubercle with eye and Cobalt-filled eye nerve, first and second visual neuropil. Bar 200 μm. b detail of first and second visual neuropil in A, second neuropil with fewer Cobalt-filled axons. Note eye nerve separating in several bundles after entering brain (arrow). Bar 50 μm. c one section after B, first and second visual neuropil with Cobalt-filled retinula axons, second neuropil with fewer Cobalt-filled axons. Bar 50 μm. d several Cobalt-filled eye nerve bundles projecting from eye to brain. Bar 50 μm. e five sections after D, eye nerve bundles fuse to one eye nerve. Bar 50 μm. f first visual neuropils packed with Cobalt-filled retinula axons. Bar 50 μm. g five sections after F, in right hemisphere first visual neuropil packed with Cobalt-filled retinula axons and second visual neuropil with few Cobalt-filled retinula axons. Bar 50 μm. EN, eye nerve; ENB, eye nerve bundles; EYE, eye; M, median eye visual neuropil; NB, neuropil border