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The ultimobranchial body in Rana pipiens

III. Sympathetic innervation of the secretory parenchyma

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Summary

  1. 1.

    Subjacent to the parenchyma of the ultimobranchial body in the frog, unmyelinated nerves within the connective tissue have been found to terminate on the basal portion of a few secretory cells. The characteristic bulbous endings of these axons contain three types of vesicles characteristic of sympathetic adrenergic nerves. There is evidence to suggest that some fibers pass between epithelial cells and form a nervous network throughout the parenchyma. Accumulations of synaptic vesicles were also seen in relation to membrane specializations which were in contact with basement membranes. The configurations were observed at other levels of the axon located in the connective tissue matrix as well as in nerve endings on parenchymal cells. A possible physiological interpretation of the two different morphological types of “innervation” is discussed.

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This project was supported in part by National Institutes of Health, Grant No. 3 TI GM 326-05.

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Robertson, D.R. The ultimobranchial body in Rana pipiens . Z. Zellforsch. 78, 328–340 (1967). https://doi.org/10.1007/BF00325317

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  • DOI: https://doi.org/10.1007/BF00325317

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