ADEQUACY OF STRETCH RECEPTORS IN THE CAT KNEE-JOINT FOR SIGNALING JOINT ANGLE THROUGHOUT A FULL RANGE OF MOVEMENT
ADEQUACY OF STRETCH RECEPTORS IN THE CAT KNEE-JOINT FOR SIGNALING JOINT ANGLE THROUGHOUT A FULL RANGE OF MOVEMENT
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DOI：
10.1113/jphysiol.1980.sp013112
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发表时间：
1980-01-01
影响因子：
5.5
通讯作者：
FERRELL, WR
中科院分区：
文献类型：
--
作者：
FERRELL, WR
为了确定在中间角度（中间范围单位）活跃的受体的存在和重要性，从背根和完整的关节神经记录了猫后关节神经中膝关节传入神经的放电。没有分离出表现出中等适应率的受体（类似于相位受体）。孤立的中档单位比例（17.8%）比之前的实验要大得多。来自一系列猫的后关节神经的直接记录显示，在所有中间位置总是有紧张活跃的受体。来自腘肌的传入神经对后关节神经中范围单位的数量没有做出重大贡献，因为去除腘肌并没有显着改变 9 只猫的关节神经中范围单位的平均数量。低剂量（0.05-0.1 mg/kg）的琥珀胆碱（SCh）对于纺锤体传入神经没有特异性，因为这些剂量的 SCh 可以提高真正关节起源的中等范围单位的静息放电。缓慢适应的关节感受器可以在整个正常运动范围内充分发出关节角度信号，并对位置感做出重要贡献。
To determine the presence and importance of receptors active at intermediate angles (mid range units), the discharge of knee joint afferents in the cat posterior articular nerve was recorded from the dorsal roots and the intact joint nerve. No receptors were isolated which exhibited intermediate adaptation rates (similar to phasic receptors). The proportion of mid range units isolated (17.8%) was substantially larger than in previous experiments. Direct recordings from the posterior articular nerves of a series of cats revealed that there were always receptors tonically active at all intermediate positions. Afferents from the popliteus muscle did not make a major contribution to the population of mid range units in the posterior articular nerve as removal of the popliteus muscle did not significantly alter the mean number of mid range units in the joint nerves in 9 cats. Succinylcholine (SCh) in low doses (0.05-0.1 mg/kg) was not specific for spindle afferents since these doses of SCh could elevate the resting discharge of mid range units of true articular origin. Slowly adapting joint receptors can adequately signal joint angle throughout the full normal range of movement and could make an important contribution to position sense.