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Anatomie comparée des propriocepteurs de la région basi-ischio-méropodite chez certains Crustacés décapodes

Comparative anatomical study of proprioceptors of the basi-ischio-meropodite region of the walking leg of some decapods (Crustacean)

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Summary

  1. 1.

    The crayfish:

  1. a)

    In the meropodite there is a myochordotonal organ (MCO) which is connected with the dorsal muscular bundle of the proximal head of the accessory flexor (AFM). This receptor contains a reduced number of cells in comparison with the crab MCO; however, a secondary group of cells with dendrites which go through the cuticle is also present.

  2. b)

    In the ischiopodite there are two chordotonal receptors:

    IM 1 near the postaxial wall is sheet-like and attached to the inferior retractor of the meropodite.

    IM 2 in the anterior part is a thin strand. The ends of the two receptors do not cross the joint and are released by protraction of the meropodite.

  3. c)

    Also described is a new receptor in the basipodite BI. This occurs only in pereiopods 2 to 5 where the B-I joint is well differentiated.

  1. 2.

    Crangon, Eupagurus, Maia, Homarus, Nephrops, Palinurus: All results are compared with previous information about the MCO and other chordotonal organs.

It is suggested that as crustaceans evolved the MCO increased in complexity and at the same time the importance of the basi-ischio region became reduced.

Résume

  1. 1.

    La morphologie générale de la région appendiculaire basi-ischioméropodite de l'Ecrevisse est décrite ainsi que ses principaux propriocepteurs.

  1. a)

    Dans le méropodite, l'organe myochordotonal (MCO) associé au rameau dorsal de la tête proximale du fléchisseur accessoire (MFA) comprend un nombre réduit de neurones. Un groupe annexe traverse la cuticule et se termine par des tiges externes mobiles.

  2. b)

    L'ischiopodite possède 2 récepteurs chordotonaux.

    IM 1, près de la paroi cuticulaire postérieure, s'étale en lame sur le rétracteur inférieur du méropodite.

    IM 2, dans la région antérieure ressemble à une fine tige oblique. Les terminaisons conjonctives de ces 2 récepteurs ne dépassent pas l'articulation et sont relachées par la rétraction du méropodite.

  3. c)

    Le Basipodite des appendices locomoteurs est un segment mobile sur lequel s'insère un groupe cellulaire BI.

  1. 2.

    Cette même région est décrite chez d'autres Astacoures ainsi que chez la Langouste Palinurus, sur Eupagurus et Maïa.

  2. 3.

    L'ensemble de ces résultats est discuté en les comparant aux travaux précédents.

Il est suggéré que MCO s'accroît au cours de l'évolution des Crustacés aux dépens des organes chordotonaux IM du fait de la réduction caractéristique de la région basi-ischiopodite.

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Clarac, F., Masson, C. Anatomie comparée des propriocepteurs de la région basi-ischio-méropodite chez certains Crustacés décapodes. Z. Vergl. Physiol. 65, 242–273 (1969). https://doi.org/10.1007/BF00298132

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  • DOI: https://doi.org/10.1007/BF00298132

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