Peripheral reorganization of nerve and muscle properties was studied following misdirection of regenerating axons to foreign muscles. The tibial nerve, which innervates all of the distal extensor muscles, was cross-united with the common peroneal nerve, which innervates all of the distal flexor muscles, in one hind limb of seven 2-6 month old cats. After 18-24 months the properties of the motor units in the reinnervated triceps surae muscles were studied by dissection and stimulation of the ventral root filaments. The normal size relationships were re-established in reinnervated medial gastrocnemius (m.g.) and lateral gastrocnemius-soleus (l.g.s.) muscles in so far as motor unit force was directly correlated with the extracellularly recorded amplitude of the axon potential and with contractile speed. The range of sizes of motor units in reinnervated m.g. and l.g.s. muscles was similar to normal, both in terms of the muscle unit size (determined by measuring tetanic tension) and axon size (determined from the amplitude of the extracellularly recorded action potential). The amplitude of the axon potentials in the crossed nerves was weakly correlated with calculated conduction velocities because of the variation in the conduction delays across the suture line. As axon potential amplitude is a direct function of axon size at the recording site, it provided a reliable measure of regenerating axon size. Motor units were classified as slow (s.), fast fatigue resistant (f.r.), fast intermediate (f.i.) or fast fatigable (f.f.) by their contractile speed and fatigue properties. Tetanic tensions generally increased from slow to fast units with s. less than f.r. less than f.i. less than f.f. in reinnervated and normally innervated muscles, but the overlap between different unit types was considerably greater in reinnervated muscles. Thus, peripheral reorganization of nerve and muscle properties according to size can occur in reinnervated muscles, irrespective of the source of the regenerating nerves.
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机译:用于消除后半部分热量的固定单元-具有可垂直移动的形状支撑的铰接式支架和夹紧机构AB FR2689373A固定装置。一块肉,颗粒状。后部悬挂用于去骨的四分之一由在一个围绕水平轴的上部铰接的托架组成,该托架具有至少一个用于肉面之一的支撑单元,以及至少一个作用在肉的相对面上的活动夹紧单元。支撑和夹紧系统均可垂直移动。后四分之一牛肉是优选的。通过将夹子直接放置在耻骨软骨关节下方来保持。使用/优点-可以将大块的肉悬空去骨。良好的操作条件可改善卫生状况。没有损坏切割设备的风险。鉴定得到改善。 AN 93379429 TI鲜鱼加工台-用于将托盘接收和排出到带有刺的工作站。和杂物输送机