Amino Acid-induced Reflexes and Their Neural Pathways in an Opisthobranch Mollusc Pleurobranchaea japonica

Chiken, Satomi; Kuwasawa, Kiyoaki; Kurokawa, Makoto; Ohsuga, Kenji

doi:10.2108/zsj.18.465

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Additionally, the latter species shows the serotonergic tpn running into the rhinophores. In two pleurobranchoidean gastropod species, nerves that may correspond to the tpn of A. californica have been described by Lee and Liegeois (1974) and Chiken et al (2001). Contrary to adults (Kandel 1979) but in agreement with results from metamorphic and juvenile individuals of A. californica (present study), the "P2" of Pleurobranchaea californica emerges from the most ventral cerebro-pedal connective (Lee and Liegeois 1974).…”

Section: Neuronal Organization Of Csos In Opisthobranch Taxasupporting

confidence: 88%

“…The efferent FMRFamide-lir nerve branch of the rhn innervating the rhinophoral base may also interact with muscle fibers and serve a similar function (Cawthorpe and Lukowiak 1990;Evans et al 1999). Since the serotonergic spn and tpn innervate inner regions of A. californica, they may be efferent neuronal pathways for chemoreceptively induced reflexive movements, as proposed by Chiken et al (2001) for P. japonica. Both nerves innervate more than one delicate sensory organ each.…”

Section: Functional Implicationsmentioning

confidence: 92%

“…It may correspond to the tpn of A. californica, since it innervates the labial tentacles and the oral veil of P. californica (Lee and Liegeois 1974). Chiken et al (2001) have identified a "second pedal nerve" innervating the oral veil, the labial tentacles, and the rhinophores of adult Pleurobranchaea japonica. It emerges from the pedal ganglion at a side near the cerebro-pedal connective (Chiken et al 2001).…”

Section: Neuronal Organization Of Csos In Opisthobranch Taxamentioning

confidence: 98%

“…Chiken et al (2001) have identified a "second pedal nerve" innervating the oral veil, the labial tentacles, and the rhinophores of adult Pleurobranchaea japonica. It emerges from the pedal ganglion at a side near the cerebro-pedal connective (Chiken et al 2001). Moroz et al (1997) have studied serotonergic immunoreactivity in the opisthobranch species P. californica and T. diomedea but have provided evidence neither for serotonergic nerve fibers of the tpn, nor for a nerve corresponding to the spn.…”

Section: Neuronal Organization Of Csos In Opisthobranch Taxamentioning

confidence: 99%

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Neurogenesis of cephalic sensory organs of Aplysia californica

2007

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The opisthobranch gastropod Aplysia californica serves as a model organism in experimental neurobiology because of its simple and well-known nervous system. However, its nervous periphery has been less intensely studied. We have reconstructed the ontogeny of the cephalic sensory organs (labial tentacles, rhinophores, and lip) of planktonic, metamorphic, and juvenile developmental stages. FMRFamide and serotonergic expression patterns have been examined by immunocytochemistry in conjunction with epifluorescence and confocal laser scanning microscopy. We have also applied scanning electron microscopy to analyze the ciliary distribution of these sensory epithelia. Labial tentacles and the lip develop during metamorphosis, whereas rhinophores appear significantly later, in stage 10 juveniles. Our study has revealed immunoreactivity against FMRFamides and serotonin in all major nerves. The common labial nerve develops first, followed by the labial tentacle base nerve, oral nerve, and rhinophoral nerve. We have also identified previously undescribed neuronal pathways and other FMRFamide-like-immunoreactive neuronal elements, such as peripheral ganglia and glomerulus-like structures, and two groups of conspicuous transient FMRFamide-like cell somata. We have further found two distinct populations of FMRFamide-positive cell somata located both subepidermally and in the inner regions of the cephalic sensory organs in juveniles. The latter population partly consists of sensory cells, suggesting an involvement of FMRFamide-like peptides in the modulation of peripheral sensory processes. This study is the first concerning the neurogenesis of cephalic sensory organs in A. californica and may serve as a basis for future studies of neuronal elements in gastropod molluscs.

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