Fig. 4
From: The complex simplicity of the brittle star nervous system
Three-dimensional reconstruction of the radial nerve cord and peripheral nerves in the arm segment in A. kochii. Other anatomical structures are provided for reference, when indicated. a Aboral view of ectoneural system (green). Components of the water-vascular system are shown in red. b Distal view of the ectoneural system. c Side view of muscles (brown) and the hyponeural system (magenta). d Oblique side view of the hyponeural system (magenta). e Proximal view of the complete nervous system. The muscles (brown) and the water-vascular system (red) are also shown. f Distal view of the complete nervous system. The orientation of the projections is indicated by axes on each image: a – aboral; d – distal; o – oral; p – proximal. Abbreviations: am – aboral intervertebral muscle; amn – aboral mixed nerve; dln – distal lateral hyponeural nerve; hin – horizontal intermuscular hyponeural nerve; ljn – lateral juxtaligametal node; mhn – median hyponeural nerve; ojn – oral juxtaligamental node; om – oral intervertebral muscle; pd – podium; pg – podial ganglion; pln – proximal lateral hyponeural nerve; pmn – proximal muscle nerve; pn – podial nerve; rnc – radial nerve cord; rwc – radial water-vascular canal; sg – spine ganglion; sn – spine nerve