Lecture_11r_Motor_Control

Lecture_11r_Motor_Control - Welcome to IB 132: Survey of...

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1 1 Welcome to IB 132: Survey of Human Physiology Lecture 10: Motor Control Professor George A. Brooks Professor Daniela Kaufer Professor Steven L. Lehman 2 Today’s Outline 1. Hierarchy 2. Sensory (Sensor) Physiology Break 3. Motor (Effector) Physiology 4. Summary: Sensorimotor Physiology 3 Fig. 9-13a Motor Unit: The alpha Motor Neuron and Innervated Fibers The SC contains all of the motor neurons that turn muscles on and regulate their force 4 The ‘Motor Servo’ May Regulate: Force Position Compliance = Δ position/ Δ force And always serves as the common output process for motor control Steven L. Lehman, Master Motor Server 5 A Muscle Spindle? a. Is a stretch receptor b. Measures proprioception c. Measures shear forces d. Is involved in reflex movements e. Choices (a) and (d) 6 An example of a spinal pattern generator ? a. Heart beat b. Breathing c. Running d. Child birth e. Choices (a) and (d)
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2 7 The Cortical Spinal Pathway ? a. Controls learned movements b. Controls cortical function c. Controls spinal function d. Is sometimes called the “Pyramidal Tract” e. Choices (a) and (d) 8 Terms Motor Program: Learned (e.g., motor cortex) or innate (e.g., spinal generator) pattern of efferent neuronal output to accomplish a task. Descending (Efferent) Pathways Ascending (Afferent) Pathways. Local Pattern Generators Mechanoreceptors: Sensing tension or movement Proprioception: Sensing position of a body part in space Voluntary movement Involuntary (unconscious, automatic, reflex) 9 Servo-Motor Defined Etymology: French servo-moteur, from Latin servus slave, servant + French -o- + moteur motor, from Latin motor one that moves. 10 Spinal Circuits use Feedback from Sensors in Muscles, Joints and other Sensory Receptors to Regulate Movements This feedback control system is called a Servo- Motor. Motor Servo Sytem 11 Fig 10-1 Hierarchical organization of neural systems in the control of body movement 12 Computerized Control of Human Locomotion
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3 13 Computerized Control of Human Locomotion is complicated. 14
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This note was uploaded on 03/09/2011 for the course IB 132 taught by Professor Brooks during the Spring '08 term at University of California, Berkeley.

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Lecture_11r_Motor_Control - Welcome to IB 132: Survey of...

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