Fig. 9.

Palpal organ of Marpissa muscosa; external morphology (a), histology (b), ultrastructure as documented by TEM (d), and 3D reconstruction of the spermophor (green) and nervous tissue (yellow) as based on segmentation of histological image stacks (c). Arrow in (a) indicates plane for semi-thin cross section at midlevel of the bulb (a), arrowhead in (c) points at terminals of the bulb nerve. Box in (b) marks position of neuronal somata and closely adjoined neurite bundles branched off bulb nerve. (d) provides insights into ultrastructure of neuronal somata and neurite bundles. Abbreviations: B Bulbus, Cy Cymbium, GE Glandular epithelium, Gli Glial cell processes, HS Haemolymph space, Htd Haematodocha, HV Haemolymph Vessel, Mt Mitochondria, Ngc Nucleus of glial cell, Nn Nucleus of neuron, Ne Neurite, S Spermophor, SC Cluster of neuronal somata, SF Seminal fluid