Receptor organs in the coxal region ofPalinurus vulgaris

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Abstract
In the coxal region ofPalinurus vulgarisLatr. the following proprioceptors are present: (1) a thoracico-coxal muscular receptor, (2) two innervated elastic strands (depressor and levator receptors), and (3) a coxo-basipodite receptor. Thus,Palinurushas the same number of these organs as some Brachyura and Anomura, but differs fromHomarusandAstacus, which have five of them.In all the five thoracic segments carrying the legs the receptor organs inPalinurusoriginate on special receptor rods which are thin projections of the endophragmal skeleton.The muscle elements of the muscular receptor are surrounded by connective tissue which in the proximal part of the muscle forms a thick sheath. To the receptor rod the muscle is attached by a short tendon. The motor fibres reach the receptor muscle at about the midpoint of its course.

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