Fig. 1

Organization of the uninjured radial nerve cord and surrounding tissues in the sea cucumber H. glaberrima. Paraffin sections stained with Safranin O, Fast Green and Weigert Iron Hematoxilyn. A Transverse section. B Longitudinal section. bw, body wall; lmb, longitudinal muscle band; rnc, radial nerve cord; tf, tube foot; wvc, water-vascular canal