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Chapter 14

Chapter 14. Human Reflex Physiology. An introduction to reflexes. Reflexes are rapid and predictable automatic responses to stimuli Neural reflex involves sensory fibers to CNS and motor fibers to effectors. Reflex arc. Five components Receptor – it is the site of the stimulus

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Chapter 14

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  1. Chapter 14 Human Reflex Physiology

  2. An introduction to reflexes • Reflexes are rapid and predictable automatic responses to stimuli • Neural reflex involves sensory fibers to CNS and motor fibers to effectors

  3. Reflex arc • Five components • Receptor– it is the site of the stimulus • Sensory neuron– transmits the stimulus • Integration Center • Monosynaptic reflex • Polysynaptic reflex • Motor neuron- conducts the impulse tothe effector • Effector– muscle or gland

  4. Arc Reflex Components

  5. Reflex classification • Somatic Reflexes • Patellar reflex (knee-jerk) • Achilles reflex • Withdrawal reflex • Crossed extensor reflex • Extension of the opposing limb

  6. Reflex classification • Superficial cord reflex • Plantar reflex • Normal response – curling the toe • Abnormal response – Babisnki’s sign

  7. The Babinski Reflexes

  8. Reflex classification • Corneal reflex - Cranial nerve V • Gag reflex • Cranial nerves IX and X

  9. Reflex classification • Autonomic Reflexes • Pupillary reflex • Ipsilateral constriction of the pupil • Consensual reflex • Contralateral constriction of the pupil • Ciliospinal reflex • Pupil dilation when pinching the neck • Salivary reflex

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