PSY 2701 Lecture Notes - Lecture 9: Primary Motor Cortex, Skeletal Muscle, Neuromuscular Junction
26 Feb 2018
School
Department
Course
Professor
Document Summary
M1: cerebellum and basal ganglia modulate activites of these hierarchically organized control systems; often thalamus is involved; loop through and back to cortex. Measuring motor activity: how do we measure muscle activity, electromyography (emg) recording of electrical activity (i. e. , potential difference) i muscles, muscles produce aps, like neurons. ***smooth and cardiac muscles are controlled by autonomic ns*** The control of movement: muscles are composed of many individual fibers. Each muscle fiber receives information from only one axon (but an axon may innervate many muscle fibers: neuromuscular junction synapse between a motor neuron axon and a muscle fiber. Motor unit motoneuron and all fibers it innervates: low ration of motoneurons-to-fibers allow for fine motor control in smaller muscles (e. g. , eye is 1:3, high ratio less fine control; usu. Each muscle fiber receives innervation from only one nerve: one nerve can innervate many fibers. Illustration of relationship between muscle spindle stimulation and gto inhibition of muscle contraction:
