Summary
The A1 sensilla are asymmetric in distribution. Each sensillum contains five bipolar neurons, the distal regions of which extend to the tip of a cuticular cone which has a terminal pore. This was shown with the scanning electron microscope, but was not seen in section. The receptor-lymph cavity of the tormogen cell and the basal cavity of the neurilemma cell contain an electron-dense material unlike other contact chemoreceptors of Locusta prepared for electron microscopy in the same manner. Isolated axons of unknown function occur below the basement membrane and also between epidermal cells surrounding the sensillum.
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References
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I wish to thank Dr. R. F. Chapman for his advice and criticism throughout the work and also Dr. E. A. Bernays, Mr. W. M. Blaney, Mr. R. J. Cooter, and Mr. T. J. Perfect for reading the manuscript. I am grateful to the British Museum (Natural History) for the use of the scanning electron microscope.
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Cook, A.G. The ultrastructure of the A1 sensilla on the posterior surface of the clypeo-labrum of Locusta migratoria migratorioides (R and F). Z.Zellforsch 134, 539–554 (1972). https://doi.org/10.1007/BF00307673
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DOI: https://doi.org/10.1007/BF00307673