Amerongen H M, Peteya D J
Department of Zoology, University of Alberta, Edmonton, Alberta, Canada, T6G 2E9.
J Morphol. 1980 Nov;166(2):145-154. doi: 10.1002/jmor.1051660203.
The sea anemones studied have two morphological types of muscle fiber. Types A and B are distinguishable on the basis of myofilament patterns, size of fibers, responses to fixation, and staining with methylene blue. Observation of the muscle in both resting and contracted states has shown that the two types do not result from differences in contraction state of the muscle. The fine structural characteristics distinguishing A and B fibers are similar to those which distinguish fast and slow muscle fibers in higher animals. The distribution of A and B fibers in Stomphia and Aiptasia is consistent with the distribution of fast and slow muscles in these two species. It is proposed that the A and B fibers represent two morphologically distinct kinds of smooth muscle, and that the capacity for fast and slow contraction in the muscles of Stomphia and Aiptasia, and possibly in all actinians, is due to morphological differentiation in the muscle system.
所研究的海葵有两种形态类型的肌纤维。A 型和 B 型肌纤维可根据肌丝模式、纤维大小、固定反应以及亚甲蓝染色来区分。对处于静息和收缩状态的肌肉进行观察表明，这两种类型并非由肌肉收缩状态的差异所致。区分 A 型和 B 型纤维的精细结构特征与区分高等动物快肌纤维和慢肌纤维的特征相似。A 型和 B 型纤维在绿海葵属和艾氏海葵中的分布与这两个物种中快肌和慢肌的分布一致。有人提出，A 型和 B 型纤维代表两种形态上不同的平滑肌，并且绿海葵属和艾氏海葵肌肉中快收缩和慢收缩的能力，可能在所有海葵中，是由于肌肉系统的形态分化所致。
