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On the Innervation of the Muscles in the Leg of the Lobster, Homarus Vulgaris Milne Edwards

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image of Archives Néerlandaises de Zoologie
For more content, see Animal Biology (Vol 53 and onwards) and Netherlands Journal of Zoology (Vol 18-52).

The innervation as described for the crayfishes has been confirmed in the lobster and it has been possible to extend the innervation scheme to more muscles. (Fig. 1). The innervation of the main and accessory flexors are described here for the first time in an Astacuran. As expected the main flexor is innervated by 4 motor fibers and 1 inhibitory one, the accessory flexor by 1 motor and 1 inhibitory fiber. The latter was shown to be a branch of the inhibitor which supplies the extensor and the bender. It has not been possible to show that the inhibitory fiber of the main flexor is likewise a branch from one of the other inhibitors. Though this was the case in all other species thus far fully investigated. The question arises therefore, whether a 4th inhibitor is present in the Astacura, or whether one of the inhibitors branches in the proximal part of the leg, before the ischiopodite. It is not possible to decide this question. It seems unlikely that the stretcher inhibitor would branch so early, as this fiber runs in the small bundle with the main flexor axons. Again, the branch to the accessory flexor of the "third" inhibitor may be taken as an indication that the latter is not involved. There remains the opener inhibitor, which in Panulirus does inhibit the main flexor, but which there does not cross to the thicker bundle. In order to decide whether 3 or 4 separate inhibitors are present it would be necessary to use the whole leg, a procedure which would kill the animal, and would even then, because of the inclusion of the place of autotomy, be difficult to perform. Because of the scarcity of the material this type of experiment was not tried.



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