Movement - Movement The Physiological Basis of Overt...

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Movement The Physiological Basis of Overt Behavior
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Lecture Overview Hierarchical control of movement Organization of the motor system Basal ganglia and cerebellum
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Sequentially organized movement Visual info to locate target Frontal lob to plan the reach and command the movement Spinal cord carries info to hand Motor neurons carry message to muscles to hand Sensory receptors on fingers send mgs to sensory cortex relaying info Sensory cortex receives info Basal ganglia judges grasp forces, cerebellum corrects for errors Spinal cord carries sensory info to brain
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Principles of Motor Function John Hughlings Jackson (1870s) Hierarchial Organization Association areas Higher order integrative functions associate sensory inputs to motor response Association Cortex Secondary Primary Brain Stem Sp. Cord Muscle
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The Forebrain Frontal lobe divisions: Motor cortex- joint mvmts Premotor cortex- motor preparation; hand-shaping or reaching; sequential mvmt Prefrontal cortex- planning mvmt Anterior association area
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Ex: hierarchical functions of movement Motor Cortex Premotor Cortex Prefrontal Cortex
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The Brainstem Responsible for species-typical behaviors Hess (1950s) Stimulating dif areas in brainstem produce dif species-specific behaviors Many nerve connections pass through (pain, pressure, touch temp, proprioception) Involved in cardiovascular system control, respiratory control, pain sensitivity control, alertness, and consciousness
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Brainstem Damage- Cerebral Palsy Umbrella term for group of non-progressive, non- contagious, motor conditions occurring before, during or shortly after birth Disorder of motor function, impairment of speech, balance, sight, hearing and/or cognition Damage to developing brain May also be due to infection/trauma or anoxia
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Brainstem Damage- Autism A brain development disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior. begin before a child is 3 years old Disorder of cognitive function Abnormal brainstem development Studies have reported associated motor problems that include poor muscle tone, poor motor planning, and toe walking
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interneuro n Sensory nerve Motor nerve Spinal Cord- pathway for conveying info btw brain and rest of the body
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