OBLIQUELY STRIATED MUSCLE
OBLIQUELY STRIATED MUSCLE
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斜横纹肌
DOI：
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发表时间：
1967
影响因子：
7.8
通讯作者：
J. Rosenbluth
中科院分区：
文献类型：
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作者：
J. Rosenbluth
用乙酰胆碱和枸橼酸哌嗪分别处理蛔虫斜纹体肌节段，使其在最短体长和最长体长时固定，然后进行光镜和电镜观察。有证据表明，两种机制的长度变化：滑动的细丝相对于粗丝，如发生在横纹肌，和剪切的粗丝相对于彼此的程度，其交错增加与延长和缩短减少。剪切机制可以解释这种肌肉和一般非横纹肌的巨大伸展性，也可以解释“可塑性”的其他表现。此外，有人建议，收缩装置是附着在肌内膜的方式，肌节可以在串行，如横纹肌，或单独行动。由于肌节实际上是纵向取向的，并且几乎与肌纤维同延，因此，对于单独收缩的肌节来说，有可能在纤维表面上相距很远的点之间有效地产生张力，从而允许非常有效地维持等长张力。
Segments of the obliquely striated body muscle of Ascaris were fixed at minimum body length after treatment with acetylcholine and at maximum body length after treatment with piperazine citrate and then studied by light and electron microscopy. Evidence was found for two mechanisms of length change: sliding of thin filaments with respect to thick filaments such as occurs in cross-striated muscle, and shearing of thick filaments with respect to each other such that the degree of their stagger increases with extension and decreases with shortening. The shearing mechanism could account for great extensibility in this muscle and in nonstriated muscles in general and could underlie other manifestations of "plasticity" as well. In addition, it is suggested that the contractile apparatus is attached to the endomysium in such a way that the sarcomeres can act either in series, as in cross-striated muscle, or individually. Since the sarcomeres are virtually longitudinal in orientation and are almost coextensive with the muscle fiber, it would, therefore, be possible for a single sarcomere contracting independently to develop tension effectively between widely separated points on the fiber surface, thus permitting very efficient maintenance of isometric tension.