Abstract
Abstract Ultrastructural investigation of the caudal muscle cells in the tadpole larva of the ascidian Dendrodoa grossularia has shown that in this species, a transverse tubular system is present; diad and triad couplings are formed with the sarcoplasmic reticulum. Peripheral couplings of the sarcoplasmic reticulum are infrequent and have only been observed at the longitudinally apposed faces of the caudal muscle cells.
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