MF lower motor neurons W10_1.ppt

MF lower motor neurons W10_1.ppt - GRAB A HANDOUT ON YOUR...

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GRAB A HANDOUT ON YOUR WAY IN (They are on the desks by the entry doors)
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Course Mechanics: Module Two Prof: Mark Frye Department of Physiological Science Research interests: sensory-motor integration Office: Botany 328 (except 2/1, 325) Time: Mondays 1-2pm PM Mapping the syllabus to the exams: out of my mouth onto the exam page…study the book!!! Review session Fri. 2/19 3-3:50 in classroom!
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The Lecture Plan: Readings in syllabus TODAY: TODAY: Lower motor neuron circuits Lower motor neuron circuits Monday 2/1: Finish spinal control. Begin brain control Discussion section: newspaper article (turn in a ‘tweet’)
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What does ‘motor systems’ mean? Motor neurons are specialized neurons that activate muscles Some motor neurons are in the spinal cord (“lower”) and directly activate muscle via synapses Some motor neurons originate in the brain (“upper”) and indirectly activate muscles via other neurons A “motor system” of comprises all of the neurons and muscles that perform given task.
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The motor system is hierarchically The motor system is hierarchically organized organized BLOCK DIAGRAM FLOW CHART
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1. Reflexive - 'simple' neural circuit resides in spinal cord (postural control for example). 2. Rhythmic - includes a central component that regulates spinal cord oscillatory circuit (walking, legs are moving, brain doesn’t have to think about walking around, only spinal cord “thinks”) 3. Voluntary - requires 'higher' levels such as cortex, basal ganglia, cerebellum (sprint, catch up with friend, turn around, these you make the decision to do) General Classes of Movement
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Movements are often classified as Movements are often classified as involuntary or voluntary involuntary or voluntary spinal reflexes posture, balance eye movement walking walking reaching speaking breathing
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Role of Sensory Information Can’t truly separate sensory from motor systems. Behavior is continuously motivated and guided by sensory input at all levels of organizations. As you’ll see, even the muscles have sensory endings (muscle spindles) embedded within them. (muscles have sensory structures built inside)
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Reach and position arm before you catch it. This is feed forward control (the positioning in line with ball, this is visually guided) After the ball hits the hand, the movement of the arm to return to its original position = feedback control. The feedback control allows you to stabilize your hand. Produce force that opposes the force induced by the falling object. Feedback mechanisms tell spinal cord to produce force and stabilize movement. Feedback is sensory info which corrects posture. Feed forward control is the outgoing command.Feedback is sensory info telling you something happened, and tells you you need to make a corrective postural change. Role of sensory information in
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This note was uploaded on 02/03/2010 for the course NEUROSCI 101A taught by Professor Scheibell during the Winter '10 term at UCLA.

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MF lower motor neurons W10_1.ppt - GRAB A HANDOUT ON YOUR...

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