Summary
The pericardial organ-anterior ramifications complexes of Uca pugilator and Callinectus sapidus were studied by transmission electron microscopy. Five morphologically distinguishable groups of granules and two groups of vesicles were identified. These granules and vesicles are present in approximately the same proportions in the pericardial organs and anterior ramifications of both species. Two of the granule groups are never mixed in the same axon terminals and are believed to represent different hormone-protein complexes. The remaining granule and vesicle groups are believed to be products of neurosecretory hormone release. Evidence that at least some of these granules and vesicles arise from intraaxonal release of neurosecretory material is presented.
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This work was supported by USPHS-NIH Training Grant GM-00669 and by the University of Texas Institutional Grant No. 5 SO 1 RR 05426-11.
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Andrews, P.M. Ultrastructural study of the pericardial organ-anterior ramifications complex neurosecretory terminals. Z.Zellforsch 144, 309–324 (1973). https://doi.org/10.1007/BF00307579
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DOI: https://doi.org/10.1007/BF00307579