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Exercise 22: Reflex Physiology

Exercise 22: Reflex Physiology. WHAT is a REFLEX?. Rapid, predictable, unlearned, involuntary motor response to a stimulus. REFLEX ARC. Chain of events in neural pathway Sensory to motor

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Exercise 22: Reflex Physiology

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  1. Exercise 22: Reflex Physiology

  2. WHAT is a REFLEX? • Rapid, predictable, unlearned, involuntarymotor response to a stimulus

  3. REFLEX ARC • Chain of events in neural pathway • Sensory to motor • Receptor  Sensory neuron  Integration Center in CNS  Response through Motor neuron  Effector

  4. Reflexes: 5 Steps • Arrival of a stimulus, activation of receptor • Activation of sensory neuron • Information processing: integration center • Activation of motor neuron • Response by an effector

  5. Know the steps & the diagram!!

  6. Somatic vs. Autonomic • Somatic Reflexes • Conscious control—skeletal muscles • Autonomic Reflexes • Not conscious—smooth, cardiac, glands

  7. 16-2

  8. Somatic: Patellar Reflex = stretch reflex Tap tendon Stimulates muscle Reflex contraction of the stretched muscle 13-20

  9. Flexor reflex + extension reflex of opposite limb 13-22 (Flexor reflex) Crossed-extensor reflex

  10. Plantar Reflex • Longitudinal stroking of sole of foot • Tibial nerve • Normal response: curling of toes 13-23

  11. Babinski’s Sign (positive Babinski reflex) • Same stimulus—but response is fanning of toes Seen in infants; disappears if descending motor pathways develop properly—if seen in adult, often a CNS injury 13-23

  12. AUTONOMIC REFLEXES • Pupillary reflex • Receptor: retina  optic nerve  brain/s cord  oculomotor nerve  • Smooth muscle controls iris • Dilation = bigger • Constriction = smaller

  13. AUTONOMIC REFLEXES • Salivary reflex • Salivary glands are effectors

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