Ziegler, Andreas and Altner, Helmut (1995) Are the most numerous sensilla of terrestrial isopods hygroreceptors? Ultrastructure of the dorsal tricorn sensilla of Porcellio scaber. CELL AND TISSUE RESEARCH, 282 (1). pp. 135-145. ISSN 0302-766X, 1432-0878
Full text not available from this repository.Abstract
The ultrastructure of the tricorn sensilla of the woodlouse Porcellio scaber was investigated in cryofixed and freeze-substituted, or chemically fixed specimens. The tricorn sensilla have a foramenized triangular-shaped outer hair and bear a poreless rod-like inner hair. The conical base of the inner hair is connected to the base of the outer hair by a complex cuticular structure. Each sensillum contains three sensory cells. The tip of one of the three dendrites contains a tubular body and is clamped between two bulges of the dendritic sheath. The two other dendrites protrude to the tip of the inner hair, flush against the cuticular wall. The microtubules in the ciliary segments are arranged in nine double tubuli that have neither osmiophilic cores nor arms. The ciliary rootlets are small. The inner segment of the largest dendrite wraps around the two smaller dendrites and one of seven enveloping cells in a mesaxon-like manner. Although this ultrastructure deviates considerably from most crustacean mechanosensitive sensilla, it nevertheless suggests a mechanosensitive function, at least for one of the sensory cells. In many aspects, the tricorn sensilla resemble the thermo-hygrosensilla of insects. However, our results suggest that the structural criteria for thermo-hygro-sensitivity used in insects cannot simply be applied to crustaceans.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FINE-STRUCTURE; FUNCTIONAL-PROPERTIES; INSECT SENSILLA; SHORE CRAB; CRUSTACEA; ORGANS; THERMORECEPTORS; CHEMORECEPTORS; LEPIDOPTERA; CRYOFIXATION; MECHANORECEPTORS; HYGRORECEPTORS; SENSILLA; WOODLOUSE, PORCELLIO SCABER (CRUSTACEA) |
| Subjects: | 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Jan 2024 09:23 |
| Last Modified: | 04 Jan 2024 09:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/52282 |
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