Fig. 7.

Magelona mirabilis, histological cross sections (5 μm), Azan staining. a: The posterior part of the dorsal neuropil of the brain neuropil terminates in a layer of enlarged neurons (S2). cu: cuticle; if: intermediate filaments. b: Intermediate filaments (if) are attached to the epidermal basal lamina and run through the neuropil (np) of the lateral medullary cords to be attached to the cuticle (cu). A giant fibre (gf) is present. S1: somata type 1. c: Glia cells with prominent intermediate filaments (if) are present in the epidermis. A cluster of neurons (S3) which possess very prominent cytoplasm around the nucleus is present in the dorso-lateral part of the brain and associated with the palp nerves. bl: basal lamina; cu: cuticle