Fig. 2From: The complex simplicity of the brittle star nervous systemTransition between the radial nerve cord and the circumoral nerve ring in A. kochii. Semi-thin sections stained with methylene blue. a Radial section (parallel to the long axis of the arm). b Horizontal section (i.e., orthogonal with respect to the oral-aboral axis) through the nerve ring. Abbreviations: nr – nerve ring; rnc – radial nerve cordBack to article page