Fig. 10
From: The velvet worm brain unveils homologies and evolutionary novelties across panarthropods
Visual pathways in E. rowelli. Horizontal optical sections of confocal micrographs of brains immunolabelled for synapsin. Anterior is up in all images. a Spatial relationship between optic neuropils (glow) and central body (grey). These structures were manually segmented in Amira and extracted from original image stack using Fiji (“Image calculator” with “AND” as operational mode). Unmodified dataset is provided in Additional file 11: Data S6. Dotted line (a and b) indicates outline of brain. Coloured arrowheads point to corresponding positions in (b–d). b–d Details of optic neuropil in ventral (b) to dorsal (d) series of sections. Bottleneck-shaped extracerebral part of optic neuropil connects to brain (arrow in b). Note bifurcations of intracerebral part of optic neuropil in its distal and proximal regions. Note also input into additional posterior stratum of posterior division of central body (e). Dotted line indicates lateral border of central body in e. ANP, antennal neuropil; CB, central body; E-ONP, extracerebral part of optic neuropil; FB, frontal body; I-ONP, intracerebral part of optic neuropil. Scale bars: 50 μm (a–d) and 10 μm (e)