Summary
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1.
The comparative activity of the myochordotonal organ MCO1 and of the chordotonal MC1 of the rock-lobster Palinurus vulgaris are studied with different types of stimulation.
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2.
Calibrated stretching of the flexor muscles shows the variety of MCO1, proprioceptive discharge (Figs. 4–6).
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3.
The contraction of the main flexor muscle and of the extensor significantly modifies MCO1 and MC1 (Fig. 7).
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4.
The contraction of the accessory flexor muscle (AFM) evokes an opposite response in MC1 and MCO1. This difference could be explained by the character of the forces exerted on the proprioceptors (Figs. 9 and 10).
a)Stimulation of the distal head of the AFM alone give a small flexion of the M-C joint. MC1, chordotonal organ associated with it, is much more sensitive to movement of the joint than to modification of the muscular tension (Fig. 12).
b)The proximal head of the AFM, excites MCO1 activity without movement of the M-C joint.
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5.
The above results on the rock-lobster are discussed in relation to previous work on the crab. New terms that are more descriptive of each receptor's function than the old terms are proposed for the different parts of the AFM.
Résumé
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1.
L'activité comparée de l'organe myochordotonal MCO1 et du récepteur chordotonal MC1 de la langouste Palinurus vulgaris a été étudiée au cours de stimulations diverses.
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2.
Des étirements bien définis, appliqués directement aux muscles fléchisseurs, ont permis de souligner la variété et la richesse de la décharge proprioceptive de MCO1 (fig. 4–6).
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3.
La contraction du muscle fléchisseur principal et de l'extenseur mettent en jeu des cellules sensorielles différentes de MCO1 et MC1 (fig. 7).
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4.
La contraction du MFA peut provoquer l'apparition d'informations de nature opposée de MCO1 et MC1, cette particularité semble s'expliquer par l'orientation des forces exercées sur les propriocepteurs (fig. 9 et 10). a)La stimulation sélective du faisceau musculaire distal du MFA provoque une légère flexion de l'articulation M-C; l'organe chordotonal MC1, associé à lui, est beaucoup plus sensible à ces mouvements articulaires qu'à des variations de tension musculaire (fig. 12). b)Le faisceau musculaire proximal du MFA module l'activité proprioceptive de MCO1 sans provoquer de mouvement de M-C.
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5.
Les différences fonctionnelles observées sur la langouste sont discutées en les comparant aux travaux des précédent auteurs. Une nouvelle dénomination des deux parties du MFA est suggérée.
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Clarac, F., Vedel, J.P. Etude des relations fonctionnelles entre le muscle fléchisseur accessoire et les organes sensoriels chordotonaux et myochordotonaux des appendices locomoteurs de la langouste Palinurus vulgaris . Z. vergl. Physiologie 72, 386–410 (1971). https://doi.org/10.1007/BF00300711
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DOI: https://doi.org/10.1007/BF00300711