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Fig. 6 | BMC Evolutionary Biology

Fig. 6

From: Morphology of the bryozoan Cinctipora elegans (Cyclostomata, Cinctiporidae) with first data on its sexual reproduction and the cyclostome neuro-muscular system

Fig. 6

Apertural area of Cinctipora elegans. Histological semithin sections, toluidine blue. a Longitudinal section through the center of the atrial sphincter which consists of thick circular muscle fibers. The thick extracellular matrix of the attachment organ as well as the thick vestibular wall at the lateral sides of the attachment area are well visible. b More lateral longitudinal section showing distinct muscles in the vestibular wall and inside the extracellular matrix of the attachment organ. Note also distinct inclusions in the distal wall of the tentacle sheath (arrow). Abbreviations: af – attachment filaments, ao – attachment organ, as – atrial sphincter, at – atrium, es – endosaccal space, ex – exosaccal space, m – muscles of the vestibular wall and attachment organ, ms – membranous sac, ts – tentacle sheath, v – vestibulum, vw – vestibular wall

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