Abstract
Multipolar nerve cells with the characteristics of muscle receptors have been shown in the arms ofOctopus vulgaris. The dendrites of these cells branch out into the muscle fibres and their axons make their way to small, intramuscular ganglion centres (ganglion of the sucker and intramuscular nerve cords), in which they seem to end. Multipolar nerve cells with characteristics similar to those of the cells described inOctopushave also been shown in the lip ofSepia officinalis. Such evidence permits one to think that these structures are more frequent in the cephalopods than has been suspected hitherto and it confirms the presence of a system of proprioceptors.
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