Mendell L M, Henneman E
Science. 1968 Apr 5;160(3823):96-8. doi: 10.1126/science.160.3823.96.
The excitatory postsynaptic potentials produced in motoneurons by impulses in single afferent fibers (Ia) have been recorded with the aid of an averaging computer. These responses were used to map the distribution of the terminals of single fibers within the pool of 300 motoneurons of the medial gastrocnemius muscle. Twelve Ia fibers were studied in separate experiments. Monosynaptic excitatory postsynaptic potentials were found in 94 percent of the 77 motoneurons investigated. This finding indicates that each of the 300 motoneurons must receive afferent fibers from almost all of the spindles of the muscle it innervates.
借助平均计算机记录了单根传入纤维（Ia）的冲动在运动神经元中产生的兴奋性突触后电位。这些反应被用于绘制单根纤维的终末在腓肠肌内侧300个运动神经元池内的分布情况。在单独的实验中研究了12根Ia纤维。在所研究的77个运动神经元中，94%发现了单突触兴奋性突触后电位。这一发现表明，这300个运动神经元中的每一个都必定从其支配的肌肉的几乎所有肌梭接收传入纤维。
