Sensory receptors of the rosette organ of Gyrocotyle rugosa |
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Authors: | FR Allison |
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Institution: | Department of Zoology, University of Canterbury, Christchurch, New Zealand |
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Abstract: | The fine structure of three sensory receptors of the rosette organ of Gyrocotyle rugosa, is described. The Type I sensory receptors, localised towards the edge of both upper and lower surfaces, are characterized by a long cilium embedded in a bulb containing two electron-dense collars and several mitochondria. The Type II sensory receptors, larger than Type I, are located on the upper surface of the rosette and have a long cilium and a ciliary rootlet. They also have two electron-dense collars and one or two mitochondria. The sensory cilia of both types are characterized by 9 + 2 axonemes. The Type III sensory receptors, localised on the under surface, lack a sensory cilium but have a ciliary rootlet and are enclosed in the tegument and musculature; there is a complicated three-dimensional spherical lattice of microfibrils associated with the rootlet. The sensory bulbs contain large numbers of membrane bound vesicles and neurotubules. A function is postulated for each of the three types of sensory receptors. |
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Keywords: | Gyrocotyle rugosa rosette organ sensory receptors mechanoreceptor proprioceptor |
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