5movementnotes.docx - 2019 Winter 5 CONTROL OF BODY MOVEMENT#2 CONTROL OF MOVEMENT BY NEURAL REFLEXES Neural reflex pathways can be classified in

5movementnotes.docx - 2019 Winter 5 CONTROL OF BODY...

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2019 Winter 5 CONTROL OF BODY MOVEMENT #2 CONTROL OF MOVEMENT BY NEURAL REFLEXES Neural reflex pathways can be classified in different ways 1. By the efferent division of the nervous system that controls the response 1. Somatic reflexes vs autonomic reflexes b. By the CNS location where the reflex is integrated 1. Spinal reflexes vs. cranial reflexes b. By whether the reflex is innate or learned 1. Innate reflexes[born with] vs. learned reflexes (conditional reflexes) b. By the number of neurons in the reflex pathway 1. Monosynaptic reflexes vs. Polysynaptic reflexes #3 AUTONOMIC REFLEXES All autonomic reflexes are polysynaptic with at least one synapses in the CNS and another in the autonomic ganglion - These involve autonomic nervous system. More than one synapse is involved Each reflex will have stimulus ID by receptor Sensory neuron CNS Integrating center Preganglionic autonomic neuron Postganglionic autonomic neuron Target cell motor part of reflex All autonomic reflexes = polysynaptic (have 3 or more neurons, 2 or more synapses.) #4 SKELETAL MUSCLE REFLEXES A monosynaptic reflex has a single synapse between afferent and efferent neurons Very fast. Because only one synapse is involved = usually spinal reflexes A polysynaptic reflex has two or more synapses. This somatic motor reflex has both synapses in the CNS Multiple interneurons. Information can descend to brain and to other tracts. #5 1) Sensory receptors = PROPRIOCEPTORS are located in skeletal muscle, joint capsules, ligaments[connective tissue] Position, stretch of muscle fiber, [length/amount of tension/position] joint receptors are involved in determining position Input signals from proprioceptors go to the CNS through sensory neurons Muscle spindles, golgi tendon organ [info about stretch] joint receptors 2) CNS integrates the input signal using networks and pathways of excitatory and inhibitory interneurons 3) Somatic motor neurons carry the output signal = alpha motor neurons 4) The effectors are contractile skeletal muscle fibers, also known as extrafusal muscle fibers.
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  • Fall '19
  • Nataliya Galifianakis

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