Fig. 15
From: The complex simplicity of the brittle star nervous system
Synaptotagmin B (SynB) in the nervous system of the arm in O. brevispinum. Longitudinal sections. a Radial nerve cord stained with the anti-SynB antibody and with the glial marker ERG1. The SynB staining is shown by itself in a’. The inset in a shows a low-magnification view of the radial nerve cord. b Aboral intervertebral muscle and ligament. Note the immunopositive bundles of nerve fibers in the muscle (arrows). c Detailed view of innervation of the aboral muscle by SynB-immunopositive neurons. d Innervation of the intervertebral ligament. Abbreviations: am – aboral muscle; en – ectoneural neuroepithelium; hn – hyponeural neuroepithelium; il – intervertebral ligament. Arrowheads in a, a’ and d how the cell bodies of SynB-immunopositive neurons