Summary
The tarsal taste hairs of the blowfly contain five receptor cells: four contact chemoreceptors and one mechanoreceptor. These cells are surrounded concentrically by two sheath cells with fluid-filled spaces (“vacuoles”) between them. The receptor cell parts are the axon, the cell body, and the dendrite. The latter has an inner segment, a transitional region, and an outer segment. The transitional region shows the 9+0 configuration of a modified cilium with two basal bodies. In the outer segment only microtubules are found. The outer segments of contact chemoreceptors pass through the tube-like dendrite sheath, then through “canal I” of the hair shaft, to reach the pore at the tip of the hair. The outer segment of the mechanoreceptor contains a “tubular body” and terminates at the hair base. The “sheath cell II” (tormogene cell) forms a folded membrane system toward the main liquor space. The fine structure of the tarsal taste hairs is discussed in relation to their function.
Zusammenfassung
Die Schmeckhaare der Fliege Phormia terraenovae enthalten fünf Rezeptorzellen (vier Kontaktchemo- und eine Mechanorezeptorzelle), die von zwei Hüllzellen unter Aussparung von Lymphräumen („Vakuole“) umgeben sind. Die Rezeptorzellen gliedern sich in Axon, Zellkörper und Dendrit, der aus Innenglied, Übergangsabschnitt und Außenglied besteht. Der Übergangsabschnitt hat die 9+0-Struktur der modifizierten Cilien mit zwei Basalkörpern. Im Plasma der Außenglieder sind nur Mikrotubuli zu erkennen. Die Außenglieder der Kontaktchemorezeptoren ziehen durch die röhrenförmige Dendritenscheide und den Kanal I des Haarschafts bis zu einem Porus in der Haarspitze, durch den sie mit den Schmeckstoffen in Kontakt kommen (Ort der Primärprozesse). Das Außenglied der Mechanorezeptorzelle enthält einen tubulären Körper und setzt an der Haarbasis an. Die Hüllzelle II (tormogene Zelle) bildet zum großen Sensillenlymphraum hin ein stark gefaltetes Membransystem aus. Der Feinbau wird in Beziehung zur Funktion der Schmeckhaare gesetzt.
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Den Herren Dr. W. Pflumm, Prof. Dr. U. Thurm, Prof. Dr. E. Schnepf und Dr. K. E. Kaissling sei für anregende Diskussionen und der Deutschen Forschungsgemeinschaft für eine Sachbeihilfe gedankt. Frau R. Föhr danken wir für ausgezeichnete technische Mitarbeit.
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Hansen, K., Heumann, H.G. Die Feinstruktur der tarsalen Schmeckhaare der Fliege Phormia terraenovae Rob.-Desv.. Z. Zellforsch. 117, 419–442 (1971). https://doi.org/10.1007/BF00324812
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DOI: https://doi.org/10.1007/BF00324812