Structure and function of the chelae and chela closer muscles of the shore crab Carcinus maenas (Crustacea: Brachyura)
Structure and function of the chelae and chela closer muscles of the shore crab Carcinus maenas (Crustacea: Brachyura)
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滨蟹 Carcinus maenas（甲壳类：Brachyura）的螯和螯近肌的结构和功能
DOI：
10.1111/j.1469-7998.1982.tb03514.x
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发表时间：
2009
影响因子：
2
通讯作者：
D. G. Waring
中科院分区：
文献类型：
--
作者：
G. Warner;D. Chapman;N. Hawkey;D. G. Waring
研究了Macinus maenas的大、小螯骨的机械优势、近侧肌纤维的羽状角和肌节长度、神经刺激引起的最大夹紧力和近侧肌肉的最大应力。所有这些因素都不同于小集合体。大、小螯骨的平均力学优势分别为0·36和0·26。近侧近侧肌远端倾角较大，近侧下降，近侧角远侧开放的大、小胆分别为35°~26°和29°~19°。完全闭合的大、小蟹近侧肌肉肌节平均长度在7·6和6·0 mm时差异显著，蟹内和蟹间差异较大。由于较高的力学优势、较大较近的背节和肌肉中较大的应力，较大的大集合带比较小的集合带挤压更强烈。平均最大应力分别为677kN/m2和474kN/m2。记录到的最大应力-1057kN rrr2-发生在大尺骨。注射高K+和咖啡因振铃器引起的挤压力量比紧张刺激的挤压要弱20%左右。
Major and minor chelae of Carcinus maenas were investigated with respect to mechanical advantage, angles of pennation and sarcomere lengths of the closer muscle fibres, maximum pinching forces induced by nervous stimulation and maximum stress in the closer muscles. Major chelae differed from minor chelae in all these factors. Mean mechanical advantages of major and minor chelae were 0·36 and 0·26, respectively. Angles of pennation were greater at the distal ends of closer muscles and declined proximally: in half open major and minor chelae distal to proximal angles were about 35–26° and 29–19°, respectively. Mean sarcomere lengths in closer muscles of fully closed major and minor chelae were significantly different at 7·6 and 6·0 fim, respectively; there was great variation within chelae and between crabs. Major chelae pinched more strongly than minor chelae due to higher mechanical advantages, larger closer apodemes and greater stress in the muscle. Mean maximum stresses in major and minor chelae were 677 and 474 kN/m2, respectively. The biggest stress recorded–1057 kN rrr2–was in a major chela. Pinching forces induced by injecting a high K+ and caffeine ringer were about 20% weaker than nervously stimulated pinches.