Fig. 13
From: The complex simplicity of the brittle star nervous system
Organization of the mixed peripheral nerves and ganglia in A. kochii. Transmission electron microscopy. a, b Aboral mixed nerve. c–e Lateral juxtaligamental node. f–h Oral juxtaligamental node. a Neuronal cell body in the wall of the arm coelom. b Neurosecretory-like cell in the wall of the arm coelom. c Low magnification view of the lateral juxtaligamental node. d Coelomic epithelial cell separating neurosecretory cells from the lumen of the coelom. e Synapse (arrow) between an axon and a process of a neurosecretory cell in the neuropil area of the lateral juxtaligamental node. f General view of the oral juxtaligamental node. g Processes of neurosecretory-like cells leaving the oral juxtaligamental node and entering the collagenous connective tissue. h Synapse (arrow) between an axon and a process of a neurosecretory-like cell. Abbreviations: ce – coelomic epithelial cell; cl – lumen of the coelom; ec – epineural canal; ee – epineural epithelium; en – ectoneural neuroepithelium; n – neuron; np – neural processes; nsc – neurosecretory cell