DEVELOPMENT OF ISOMETRIC TENSION IN SIMIAN EXTRAOCULAR MUSCLE
DEVELOPMENT OF ISOMETRIC TENSION IN SIMIAN EXTRAOCULAR MUSCLE
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DOI：
10.1113/jphysiol.1971.sp009655
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发表时间：
1971-01-01
影响因子：
5.5
通讯作者：
LUSCHEI, ES
中科院分区：
文献类型：
--
作者：
FUCHS, AF;LUSCHEI, ES
1.在麻醉猴的外直肌中测量电刺激外展神经引起的等距张力。2.外直肌在刺激频率大于400次/秒时最大张力没有增加。3.然而，在400和600/秒之间的频率下，张力的变化率增加，使得更快地达到最大张力。4.大于600/秒的速率不会导致张力变化率进一步增加，实际上会导致最大张力降低。5.此外，由于来自眼运动神经的单纤维记录显示最大放电速率小于600/秒，因此展神经核中放电速率大于600/秒的单位可能是中间神经元。6.以30/秒的速度刺激，猫慢或慢抽搐纤维产生融合收缩的频率，产生了不可测量的紧张成分。因此，慢速肌纤维所贡献的力在眼球运动中可能起着微不足道的作用。
1. Isometric tension resulting from electrical stimulation of the abducens nerve was measured in the lateral rectus muscle of anaesthetized monkeys. 2. The lateral rectus showed no increase in maximum tension at stimulus frequencies greater than 400/sec. 3. However, at frequencies between 400 and 600/sec, the rate of change of tension increased so that maximum tension was achieved more rapidly. 4. Rates greater than 600/sec caused no further increases in the rate of change of tension and actually resulted in a decrease of maximum tension. 5. Since, in addition, single fibre recordings from ocular motor nerves reveal maximum discharge rates of less than 600/sec, units in the abducens nucleus that fire at greater than 600/sec are likely interneurones. 6. Stimulation at rates of 30/sec, the frequency at which feline slow or slow twitch fibres produce fused contraction, produced no measurable tonic component of tension. Therefore, the force contributed by slow muscle fibres probably plays an insignificant role during eye movements.