An analysis of bailer movements responsible for gill ventilation in the crab,<i>cancer novae‐zelandiae</i>

Pilkington, J. B.; Simmers, A. J.

doi:10.1080/10236247309386917

Cited by 28 publications

(10 citation statements)

References 16 publications

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“…Synchrony in phasing between SFM and ASDM has been noted previously in a variety of crustacea (Pasztor, 1968;Young, 1975;Pilkington and Simmers, 1973). The present set of experiments has shown that in crayfish this relationship is maintained partially by shared innervation.…”

Section: Discussionsupporting

confidence: 82%

“…The muscles responsible for scaphognathite beating are divisible into two groups: depressors and levators, each innervated by a separate nerve trunk (Pasztor, 1968;Pilkington and Simmers, 1973;Young, 1975). The two nerves (nerves a and b) are thought to carry commands from a central oscillator that activates the depressor and levator muscles alternately (Mendelson, 1971).…”

Section: Introductionmentioning

confidence: 99%

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Innervation, synaptic physiology, and ultrastructure of three muscles of the second maxilla in crayfish

Moody-Corbett

Pasztor

1980

J. Neurobiol.

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SUMMARYInnervation patterns, synaptic properties, and fiber ultrastructure were studied in three muscIes of the second maxilla of Procambarus clarkii and Orconectes uirilus. All three muscles, ASDM (anterior scaphognathite depressor muscle), CFM (coxopodite flexor muscle), and SFM (scaphognathite flexor muscle), were polyneuronally innervated, receiving two, three, and four excitors, respectively. Two of the four excitors innervating SFM were branches of the two excitors supplying ASDM. No muscle received inhibitor axons. Synapses tended to be low output and show a high degree of facilitation as measured by the facilitation index of Atwood and Bittner. Ranges of EPSP amplitudes and facilitation indices were common to all excitors. Muscle fibers uniformly showed short sarcomere lengths and low thin-to-thick filament ratios. These physiological and ultrastructural peripheral features are consistent with the nature of the motor score from the central rhythm generator.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Innervation, synaptic physiology, and ultrastructure of three muscles of the second maxilla in crayfish

Moody-Corbett

Pasztor

1980

J. Neurobiol.

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“…The two pump chambers form the obvious humps of the hepatic region of the carapace of E. tuberosn. The respiratory currents are generated by the beating of the scaphognathites in a manner similar to that described for other species of crabs (Atkinson, 1971;Scammell, 1971;Pilkington & Simmers, 1973). E. tuberosa is unusual in that ventilation of the branchial chambers is not continuous but takes place in a characteristic intermittent manner (Schembri, 1979).…”

Section: Structure Of the Branchial Chambersmentioning

confidence: 83%

The functional morphology of the branchial chambers and associated structures of Ebalia tuberosa (Crustacea: Decapoda: Leucosiidae), with special reference to ventilation of the egg‐mass

Schembri

1981

Journal of Zoology

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Ebalia tuberosu bury themselves in sediment but do not construct permanent burrows. There are no functional Milne-Edwards' openings, the respiratory currents passing along channels formed by apposition of several interlocking buccal appendages. In adult females, the dome-like abdomen fits over the concave sternum to form a large abdominosternal chamber which completely encloses the egg-mass. The branchial chambers are connected to the abdominosternal chamber by two branchiosternal canals plugged by modified pericardial sacs which act as one-way valves. When the telson is extended, water is sucked into the abdominosternal chamber and then into the branchial chambers, thus ventilating the eggmass. The setation of the respiratory and associated structures serves to lock appendages together, to form screens and gaskets and to groom the buccal appendages. Setal morphology is shown to be correlated with function.

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“…The biogenic amines could influence ventilatory muscles other than L2b. The ten muscles of the gill bailer, however, function together as a unit to produce a smooth oscillatory movement of constant amplitude (Pilkington and Simmers, 1973;Young, 1975). Preferential agumentation of the performance of only a subset of these muscles might be expected to produce less-coordinated, inappropriate movements.…”

Section: Discussionmentioning

confidence: 99%

Modulatory effects of proctolin on a crab ventilatory muscle

Mercier

Wilkens

1985

J. Neurobiol.

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Proctolin enhances nerve-evoked, phasic contractions of a selected respiratory muscle of the shore crab, Carcinus maenas, but has no effect on muscle tonus. Proctolin also increases the work and power output of this muscle. These effects are functionally appropriate in view of previous reports that proctolin stimulates the ventilatory rhythm. They also suggest that proctolin exerts coordinated modulatory control at the central and peripheral levels of the gill ventilatory system. In contrast, serotonin, dopamine and octopamine have no effect on this muscle.

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An analysis of bailer movements responsible for gill ventilation in the crab,cancer novae‐zelandiae

Cited by 28 publications

References 16 publications

Innervation, synaptic physiology, and ultrastructure of three muscles of the second maxilla in crayfish

Innervation, synaptic physiology, and ultrastructure of three muscles of the second maxilla in crayfish

The functional morphology of the branchial chambers and associated structures of Ebalia tuberosa (Crustacea: Decapoda: Leucosiidae), with special reference to ventilation of the egg‐mass

Modulatory effects of proctolin on a crab ventilatory muscle

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