Die Wirbellosen des Weissen Meeres. Erster Band : zoologische Forschungen an der Küste des Solowetzkischen Meerbusens in den Sommermonaten der Jahre 1877, 1878, 1879 und 1882 /

Wagner, Nicolas

doi:10.5962/bhl.title.65513

Cited by 19 publications

(29 citation statements)

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“…3A). The hook sacs, which are unique to gymnosomes, contain several curved, chitinous hooks of different size that are used to pull the soft body tissues of the prey into the buccal cavity (Wagner, 1885;Lalli, 1970). Each hook sac contains three muscle groups: outer circular muscle, lateral and median longitudinal muscles, and a hook retractor muscle in the center (Lalli, 1970).…”

Section: Results Myomodulinmentioning

confidence: 99%

“…Clione is not only phylogenetically distinct from Aplysia, it also occupies a different ecological niche, and, in particular, it has a feeding behavior that is quite different from that of Aplysia. Clione is a highly specialized, actively swimming predator and has, in addition to the toothed radula that is characteristic of other gastropod molluscs, special organs for prey capture and acquisition, including two groups of chitinous hooks retracted in muscular hook sacs and specialized oral appendages called buccal cones (Wagner, 1885;Lalli, 1970). To obtain information about the potential sites at which myomodulins and buccalins may act as neuromodulators in the pteropod mollusc Clione limacina, we have used immunohistochemical techniques to reveal the distribution of myomodulin-like and buccalin-like immunoreactivities in the CNS and peripheral tissues, particularly those involved in feeding.…”

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confidence: 99%

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Distribution of myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues of the mollusc,Clione limacina

Norekian

Satterlie

1997

J. Comp. Neurol.

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The distribution of the myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues associated with feeding was examined in the pteropod mollusc Clione limacina by using wholemount immunohistochemical techniques. Immunoreactive neurons and cell clusters were located in all central ganglia except the pleural ganglia, with approximately 50 central neurons reactive to myomodulin antiserum and 60 central neurons reactive to buccalin antiserum. All central ganglia contained a dense network of myomodulin- and buccalin-immunoreactive processes in their neuropil regions and connectives. In the periphery, the primary attention was focused on the tissues associated with feeding, especially feeding structures unique to Clione, such as hook sacs and buccal cones, which are used for prey capture and acquisition. All of these feeding structures contained myomodulin-immunoreactive and buccalin-immunoreactive fibers, with each peptide family showing specific innervation fields that were common in buccal cones and were totally different in the hook sacs. The specific central and peripheral distribution of myomodulin-like and buccalin-like immunoreactivities as well as specific effects of the exogenous peptides on identified neurons involved in the control of feeding behavior and swimming suggest that neuropeptides from myomodulin and buccalin families act as neurotransmitters or neuromodulators in a variety of central circuits and in the peripheral neuromuscular systems associated with feeding in Clione limacina.

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Section: Results Myomodulinmentioning

confidence: 99%

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confidence: 99%

Distribution of myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues of the mollusc,Clione limacina

Norekian

Satterlie

1997

J. Comp. Neurol.

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“…This finding suggests that activation of ciliary beating in the foregut by the Bc-FG cells is likely to occur during feeding behavior of Clione. Clione does not bite small pieces from the prey during feeding as many other animals do, but pulls the entire prey from its shell using specialized feeding structures, chitinous hooks and toothed radula (Lalli, 1970;Lalli and Gilmer, 1989;Wagner, 1885). Therefore, activation of cilia in the foregut of Clione during feeding may help with swallowing the prey and facilitate its extraction from the shell.…”

Section: Role Of Bc-fg Cells In the Feeding Behavior Of Clionementioning

confidence: 99%

“…Homologous buccal neurons with similar functions were also described in Lymnaea and Tritonia (Lloyd and Willows, 1988;Perry et al, 1998). Clione is a highly specialized carnivore, which feeds only on two species of shelled pteropod mollusks of the genus Limacina (Lalli, 1970;Lalli and Gilmer, 1989;Wagner, 1885). As a consequence of their high feeding specialization, Clione and other mollusks from the order Gymnosomata have a unique feeding structure -chitinous hooks, whose functional role is to grab the soft body of Limacina, and pull it out of its shell and into their buccal cavity.…”

Section: Introductionmentioning

confidence: 99%

Buccal neurons activate ciliary beating in the foregut of the pteropod molluskClione limacina

Malyshev

Balaban

2009

Journal of Experimental Biology

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SUMMARYBeating of cilia lining the foregut of gastropods facilitates the swallowing of food and, therefore, plays a role in feeding behavior. Despite the fact that neural control of feeding is well studied in mollusks, no neurons controlling ciliary beating in the foregut have been identified to date. Here we describe for the first time a pair of buccal neurons innervating the foregut of Clione. Intracellular stimulation of these neurons induced vigorous activation of cilia lining the foregut in a semi-intact preparation. Using immunochemistry labeling, buccal foregut cells were found to contain peptides similar to CNP neuropeptides of the terrestrial snail Helix lucorum. Application of DYPRL-amide, a member of the Helix CNP peptide family, mimicked the effect of buccal foregut cell stimulation on ciliary activity. Induction of fictive feeding in an isolated CNS preparation resulted in the activation of buccal foregut cells suggesting that these cells control ciliary beating in the foregut during feeding. Thus, cilia-activating buccal neurons may represent a new intrinsic element of the neural control of feeding in gastropods.

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“…Clione is a highly specialized predator that has adapted feeding structures for prey capture: oral appendages, called buccal cones (Wagner, 1885;Lalli, 1970). Buccal cones are normally cone-shaped and retracted inside the buccal cavity.…”

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confidence: 99%

GABAergic Excitatory Synapses and Electrical Coupling Sustain Prolonged Discharges in the Prey Capture Neural Network ofClione limacina

Norekian

1999

J. Neurosci.

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Afterdischarges represent a prominent characteristic of the neural network that controls prey capture reactions in the carnivorous mollusc Clione limacina. Their main functional implication is transformation of a brief sensory input from a prey into a lasting prey capture response. The present study, which focuses on the neuronal mechanisms of afterdischarges, demonstrates that a single pair of interneurons [cerebral A interneuron (Cr-Aint)] is responsible for afterdischarge generation in the network. Cr-Aint neurons are electrically coupled to all other neurons in the network and produce slow excitatory synaptic inputs to them. This excitatory transmission is found to be GABAergic, which is demonstrated by the use of GABA antagonists, uptake inhibitors, and double-labeling experiments showing that Cr-Aint neurons are GABA-immunoreactive. The Cr-Aint neurons organize three different pathways in the prey capture network, which provide positive feedback necessary for sustaining prolonged spike activity. The first pathway includes electrical coupling and slow chemical transmission from the Cr-Aint neurons to all other neurons in the network. The second feedback is based on excitatory reciprocal connections between contralateral interneurons. Recurrent excitation via the contralateral cell can sustain prolonged interneuron firing, which then drives the activity of all other cells in the network. The third positive feedback is represented by prominent afterdepolarizing potentials after individual spikes in the Cr-Aint neurons. Afterdepolarizations apparently represent recurrent GABAergic excitatory inputs. It is suggested here that these afterdepolarizing potentials are produced by GABAergic excitatory autapses.

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Die Wirbellosen des Weissen Meeres. Erster Band : zoologische Forschungen an der Küste des Solowetzkischen Meerbusens in den Sommermonaten der Jahre 1877, 1878, 1879 und 1882 /

Cited by 19 publications

References 0 publications

Distribution of myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues of the mollusc,Clione limacina

Distribution of myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues of the mollusc,Clione limacina

Buccal neurons activate ciliary beating in the foregut of the pteropod molluskClione limacina

GABAergic Excitatory Synapses and Electrical Coupling Sustain Prolonged Discharges in the Prey Capture Neural Network ofClione limacina

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