THE EFFECT OF COOLING ON MAMMALIAN MUSCLE SPINDLES
THE EFFECT OF COOLING ON MAMMALIAN MUSCLE SPINDLES
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DOI：
10.1016/0014-4886(60)90004-2
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发表时间：
1960-01-01
影响因子：
5.3
通讯作者：
BUCHWALD, JS
中科院分区：
文献类型：
--
作者：
ELDRED, E;LINDSLEY, DF;BUCHWALD, JS
逐渐降温可以减缓猫腓肠肌感觉感受器的冲动释放。要么是躺在油池里的整个肌肉，要么是只在单个感觉器官附近的肌肉，在插入肌肉的热电偶监测下，温度比正常体温低10到15摄氏度。一般情况下，去传出的环旋、花朵和腱器官传入的放电减慢，由单个单位的传导率和特有的反应模式来识别。在维持稳定放电所需的所有张力之上，来自纺锤的发射都减少了，在更高的张力下，绝对降幅更大。与对照相比，环旋末梢的影响可能比喷花更大。具有完整传出神经的纺锤体的放电也变慢。中枢兴奋性的改变可能是由小腿肌肉降温产生的传入放电的变化引起的。在用加拉胺麻痹的去大脑猫中，当其他去神经的小腿的腓肠肌内侧肌冷却时，由次极量刺激切断的腓肠肌外侧神经所引起的单突触反射减少。小腿三头肌的去大脑硬度也随着降温而降低。
Gradual cooling slowed the discharges of impulses from sensory receptors in the gastrocnemius muscle of the cat. Either the entire muscle as it lay in an oil pool, or the vicinity only of individual sensory organs, was cooled 10 to 15[degree]C below normal body temperature as monitored by a thermocouple inserted into the muscle. Slowing, in general, occurred in the discharge of de-efferented annulospiral, flower-spray and tendon organ afferents, identified by conduction rates of individual units and characteristic patterns of response. The firing from spindles decreased at all tensions above that needed to sustain a steady discharge, with greater absolute decreases at higher tensions. Relative to control rates, annulospiral endings were probably affected more than flower-spray ones. The discharges from spindles having intact efferent innervation were also slowed. Alterations in central excitability may result from changes in afferent discharges produced by cooling of calf muscles. In decerebrate cats paralyzed with gallamine, monosynaptic reflexes elicited by submaximal stimulation of the severed lateral gastrocnemius nerve were reduced when the medial gastrocnemius muscle of the otherwise denervated leg was cooled. Decerebrate rigidity in the triceps surae muscle also decreased with cooling.