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Fig. 6 | Frontiers in Zoology

Fig. 6

From: The central nervous system of Oweniidae (Annelida) and its implications for the structure of the ancestral annelid brain

Fig. 6

Palmgrens silver impregnation of Owenia fusiformis. A,C,E from frontal to caudal; B,D,F detail of picture on left. a: In the dorsal part of the brain (br) ring no commissure or tracts are discernible. mo: mouth. B: The brain (br) is located inside the epidermis (ep). Glia cells containing intermediate filaments (if) are arranged rectangular to the neurites of the brain (br). Cells are attached to the basal lamina (bl) of the epidermis. c: The brain (br) ring encircles the esophagus (es). d: The basal lamina (bl) is narrowed, at the points where the brain (br) neuropil is located. Some neurites (ne) are strongly stained by silver. if: intermediate filaments. e: The brain ring gives rise to paired, rectangular arranged medullary cords (mc). The cords are occasionally connected by commissures (co). The basal lamina (bl) of the epidermis is narrowed at the location of the neuropil of the medullary cords. f: The medullary cords (mc) are located inside the epidermis (ep), directly attached to the basal lamina (bl). co: commissure

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