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An electron microscopic study of two types of muscle fibers in the pharyngeal pad of crussian carp, Carassius carassius

In the pharyngeal pad on the roof of the anterior pharynx of Carassius carassius two types of thin striated muscle fibers (1.5‐10 μm in diameter) were found. No pattern was discerned in the orientation of muscle fibers which form a loose tissue as a whole. One of them (Z fiber) is characterized by position of triads at the level of Z lines, and in the other type (A‐I fiber) they were seen at the junction of the A and I bands.