Summary
Formaldehyde-induced fluorescence (Falck-Hillarp technique) provided histochemical evidence for the presence of catecholamines in the sensory epithelia (macula and crista) of the Octopus statocyst. A specific bright green fluorescence occurred in the neuronal plexus beneath the receptor cell layers of the epithelia and in the appropriate nerves. The histochemical findings are discussed with reference to the well-known neuronal and synaptic organization of the epithelia and to relevant results in cephalopods as well as in other molluscs. All data support the hypothesis that in the receptor systems of the Octopus statocyst catecholamines (probably dopamine and/or noradrenaline) act as neurotransmitters in the efferent fibre system.
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Budelmann, BU., Bonn, U. Histochemical evidence for catecholamines as neurotransmitters in the statocyst of Octopus vulgaris . Cell Tissue Res. 227, 475–483 (1982). https://doi.org/10.1007/BF00204779
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DOI: https://doi.org/10.1007/BF00204779