Fig. 6
From: The visual system of harvestmen (Opiliones, Arachnida, Chelicerata) – a re-examination
Transmission electron microscopy of Platybunus pinetorum of region where eye nerve enters brain and first visual neuropil (a, c, e, and g sagittal sections; b, d, f, transversal sections; dorsal is up). a eye nerve separates into several bundles after entering brain; with cell bodies between bundles (stitched image series). Bar 10 μm. b, c detail of eye nerve before entering the brain; note pattern of arrangement of retinula axons. Bars 10 μm and 5 μm, respectively. d, e detail of region where eye nerve separates into several nerve bundles with cell bodies in between; note no synapses in this region. Bars 10 μm and 5 μm, respectively. e, f detail of region where eye nerve bundles enter first visual neuropil. Bars 10 μm and 5 μm, respectively. EN, eye nerve; ENB, eye nerve bundles; M, median eye visual neuropil