Fig. 7
From: The complex simplicity of the brittle star nervous system
Neurons in the ectoneural neuroepithelium of the radial nerve cord in A. kochii. Transmission electron microscopy. a Sub-apical neuron. a’ Cilium in a subapical neuron (n). b Neuron (n, colored) that reaches the lumen of the epineural canal (ec). c – f’ Ectoneural neuropil. c and d show the transversal and longitudinal sections, respectively, of the neuropil area containing processes of giant neurons (gn). e Process of the neurosecretory-like cell (nsc). f and f’ Synapses (arrows) in the neuropil. Abbreviations: bp – basal process of a radial glial cell; ec – epineural canal; ee – epineural epithelium (roof of the epineural canal); gn – giant neuronal processes; n – neuron; np – neural process; nsc – neurosecretory-like cell; rg – radial glial cell