The organization of the flight muscle in a dragonfly, Aeshna sp. (Odonata).

D S SMITH
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引用次数: 77

Abstract

The structure of the flight muscle of a dragonfly (Aeshna sp.) has been studied with the light and electron microscopes, and the organization of this specialized tubular muscle is described. This tissue is characterized by the great development of the sarcosomes, which are slab-like and are arranged within the fiber opposite each sarcomere of the radially oriented lamellar myofibrils. A well developed and highly ordered sarcoplasmic reticulum is present, consisting of perforated curtain-like cisternae extending across the face of each fibril, together with tubular invaginations of the fiber plasma membrane situated within indentations in the sarcosomes and traversing the fibril surface midway between the Z and M levels. The structure of these fibers, and notably the organization of the reticulum, is compared with that of other types of muscle, and the possible role of the two components of the sarcoplasmic reticulum in the contraction physiology of the dragonfly muscle fiber is discussed.

蜻蜓的飞行肌肉的组织。
用光学显微镜和电子显微镜研究了蜻蜓(Aeshna sp.)飞行肌的结构,并描述了这种特殊管状肌肉的组织。该组织的特征是肌小体的大量发育,它们呈板状,排列在纤维内,与径向取向的板层肌原纤维的每个肌小体相对。存在发育良好且高度有序的肌浆网,由横跨每个纤维表面的穿孔幕状池组成,以及位于肌体凹痕内的纤维质膜管状内陷,并穿过纤维表面,介于Z和M水平之间。这些纤维的结构,特别是网的组织,与其他类型的肌肉进行了比较,并讨论了肌浆网的两个组成部分在蜻蜓肌纤维收缩生理中的可能作用。
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