Khan M A
Cytobios. 1979;26(103-104):167-73.
Type I white fibres constitute the pale band of the pigeon serratus metapatagialis (SMP) muscle. The histochemical activity of succinate dehydrogenase (SDH), lactate dehydrogenase (LDH), acetylcholinesterase (AChE) and butyryl cholinesterase (BuChE) was studied in these unique muscle fibres. The muscle fibres possess low SDH but reciprocally high LDH activity. These tonic glycolytic fibres displayed high AChE activity at the myoneural junctions, but the latter lacked BuChE activity. Both AChE and BuChE activities were, however, present at the neuromuscular junctions of the twitch muscle fibres of the SMP muscle. Since BuChE is a precursor in AChE synthesis, the slow-tonic muscle fibres probably depend solely on the AChE transported axonally.
I型白色纤维构成了家鸽后翼锯肌（SMP）的浅色带。对这些独特肌纤维中的琥珀酸脱氢酶（SDH）、乳酸脱氢酶（LDH）、乙酰胆碱酯酶（AChE）和丁酰胆碱酯酶（BuChE）的组织化学活性进行了研究。肌纤维具有低SDH活性，但LDH活性则相反较高。这些紧张性糖酵解纤维在肌神经连接处表现出高AChE活性，但后者缺乏BuChE活性。然而，AChE和BuChE活性在SMP肌的快肌纤维的神经肌肉连接处均存在。由于BuChE是AChE合成的前体，慢紧张性肌纤维可能仅依赖于轴突运输的AChE。
