CSB332H1 Lecture Notes - Lecture 16: Golgi Tendon Organ, Motor Neuron, Afferent Nerve Fiber

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Limb muscles are controlled my motorneurons & interneurons of the spinal motor apparatus. Neural organization of motor control is hierarchical: simplest level: sensory neurons synapse w motoneurons in spinal cord to mediate simple reflexes, basic reflex ex. The motor unit: sherrington: spinal motoneuron = final common path because all the neural influences that concern movement or posture converge upon it. Major motoneurons of spinal cord motoneurons: cause muscles to contract motoneurons. Single muscle spindle fibre (1a) has multiple inputs to multiple alpha motoneurons. 1 act pot in a single 1a afferent synaptic pot in alpha motoneuron only a fraction of a mv (blue: very small depolarization. Presynaptic fiber fires 3 act pots rapidly in succession synaptic pots (brown) ride on falling phase of previous one, increasing the depolarization. Prob enough to have effect in motoneuron. A muscle (e. soleus in cat) may have 50 1a afferents converging onto 1 motoneuron.

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