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Fig. 7 | Zoological Letters

Fig. 7

From: Detailed morphology of tentacular apparatus and central nervous system in Owenia borealis (Annelida, Oweniidae)

Fig. 7

Organization of the nervous system of the head of Owenia borealis. A General anatomy of the nervous system viewed from the ventral side: Z-projection after double immunostaining against acetylated alpha-tubulin (red) and serotonin (green) and staining with DAPI (blue). B Serotonin-lir nerve elements of the head viewed from the ventral side; Z-projection after immunostaining against serotonin (green). Some serotonin-lir cells in the epithelium of tentacles are indicated by arrowheads. C Semi-thin transverse section of the outer ring of the anterior nerve center. D Semi-thin transverse section of the inner (=circumoral) nerve ring of the anterior nerve center. Abbreviations: anc – outer ring of the anterior nerve center; cf. – collar fold; ecm – extracellular matrix; gcI – gland cell of first type; gcII – gland cell of second type; if – intermediated filaments; lm – longitudinal muscles; lmc – lateral medullary cord; mi – microvilli; np – neuropil; pk – perikarya; sb – setae bundle; scdt – serotonin-lir cells of the digestive tract; t – tentacle; vmc – ventral medullary cord

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