Fig. 3From: The anatomy and development of the nervous system in Magelonidae (Annelida) – insights into the evolution of the annelid brainMagelona mirabilis, histological cross sections (5 μm), Palmgrens silver impregnation, frontal (A) to caudal (C). a: The anterior part of the brain (abr) is composed of a compact trapezoid neuropil. so: somata. b: Neurites in the dorsal part of the brain (dpbr) is composed of neurites which are arranged in parallel to the body axis. c: Some neurites are stronger impregnated by silver ions than the surrounding neurites. mo: mouthBack to article page