Summary
The larynx musculature of female tree frogs is very poorly developed compared with that of males. This is probably due to the fact that they are less used; female tree frogs do not produce mating calls.
The larynx muscles of the female are composed of fibers with small, medium, and large cross-sections. The distribution of the motor end plates varies correspondingly: in regions with fibers of very small diameter the density of synapses is about 33 times greater than in regions with large fibers. There is also a difference in fine structure between male and female laryngeal muscles. The muscles of females comprise red fibers, white fibers, and various transitional types. The arrangement of the triads and their number per sarcomere is the same in all fiber types. All fibers contain about the same amounts of glycogen, but the fat content varies widely among the different types.
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Supported by the Deutsche Forschungsgemeinschaft.
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Eichelberg, H., Schneider, H. The fine structure of the larynx muscles in female tree frogs, Hyla a. arborea L. (Anura, Amphibia). Cell Tissue Res. 152, 185–191 (1974). https://doi.org/10.1007/BF00224694
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DOI: https://doi.org/10.1007/BF00224694