Abstract

Electron-dense plaques, often seen in association with the plasma membranes of pre-heartbeat salamander myocardial cells, appear to be directly involved in early Z band formation. In differentiating myocardial cells of higher vertebrates, Z band material has been observed in close proximity to the plasma membranes and as isolated electron-dense material in the deep cytoplasm. The present study explores the fine structural features of Z band formation in salamander myocardium from early tailbud embryos (Harrison stage 25) through the adult. Hearts were fixed In a 0.1 M phosphate buffered formaldehyde-glutaraldehyde-picric acid-styphnic acid mixture and were post-fixed and embedded using standard methods.

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