motor_S12 - The sensorimotor system Motor Behaviors...

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The sensorimotor system
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Motor Behaviors Locomotion Walking Running Swimming Flying Species Typical Action Patterns Courtship Defense Grooming Ingestion Acquired Skills Speech Tool Use Writing Driving
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Types of Muscles Smooth Cardiac Skeletal Striated Controlled by autonomic nervous system e.g., blood vessels, GI system Heart muscle Controlled by autonomic nervous system Muscles that move us Connected to bones via tendons involuntary Voluntary control
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Skeletal Muscle Anatomy: Extrafusal Fibers Rosenzweig M.R. et al., Biological Psychology (2002) Muscle contraction provides the muscle’s motive force Activation of motor neuron muscle contraaction
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Motor Unit Smallest units of motor activity Fewer fibers per neuron higher degree of selective movements Single alpha motor neuron serves several extrafusal muscle fibers
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Skeletal Muscle Anatomy: Intrafusal Fibers Rosenzweig M.R. et al., Biological Psychology (2002) Sensory organs: served by both sensory and motor neurons Stretch receptor: detect changes in muscle length
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Skeletal Muscle Anatomy: Golgi Tendon Organ Stretch receptor: detect changes in muscle tension
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Sensory Feedback Rosenzweig M.R. et al., Biological Psychology (2002)
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Muscle Physiology Release of Acetylcholine Depolarization of muscle fibers (end plate potential)
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Muscle Physiology Depolarization of muscle fibers Ca ++ channels open Proteins cross link Muscle contraction Bear M.F. et al., Neuroscienc: Exploring the Brain (2007) Rosenzweig M.R. et al., Biological Psychology (2002)
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Flexion and Extension Bear M.F. et al., Neuroscienc: Exploring the Brain (2007) Rosenzweig M.R. et al., Biological Psychology (2002) Muscles contract (limbs flex) Contraction of flexor muscles Contraction of extensor muscles
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Reflexes Not everything requires the brain Touch a hot stove (sensory neuron) spinal interneuron motor neuron muscle (Move quickly!)
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Sensorimotor Systems General points: - Motor movement is continuously guided by sensory
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motor_S12 - The sensorimotor system Motor Behaviors...

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