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Fig. 3 | BMC Evolutionary Biology

Fig. 3

From: The nervous system of the lophophore in the ctenostome Amathia gracilis provides insight into the morphology of ancestral ectoprocts and the monophyly of the lophophorates

Fig. 3

Organization of the cerebral ganglion of Amathia gracilis (semithin sections). a Longitudinal section of the cerebral ganglion in the zooid. The colours mark different zones of the ganglion: pink - oral (distal), blue - central, yellow - anal (proximal). The oral side is to the left, and the anal side is to the right. The thick black line indicates the disto-proximal axis. b–e Cross sections of the cerebral ganglion at different levels (shown on A). The anal side is toward the top, and the oral side is toward the bottom. b The uppermost portion of the ganglion. Two zones are evident. c 4 μm below the section in Fig. B. d 3 μm below the section in Figure C. e 3 μm below the section in Figure D. Abbreviations: cg - cerebral ganglion; con - circum - oral nerve ring; dpk - pair of distal perikarya; m - mouth; mv - muscles of vestibulum; phr - pharynx; np - neuropil; ve - vestibulum; ppk - pair of proximal perikarya

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BMC Ecology and Evolution

ISSN: 2730-7182

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