Spinal Refleksler

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Spinal Refleksler

• Yrd. Doç. Dr. Sefa Gültürk
• Fizyoloji Anabilim Dali
• Cumhuriyet Üniversitesi Tip Fakültesi
• sgulturk_at_cumhuriyet.edu.tr

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Spinal Cord -medulla spinalis
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The Spinal Cord
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The spinal cord

• Spinal nerves innervate specific regions of the
  body
• Attach to spinal cord segments via two roots
• posterior - sensory inputs
• Dorsal root ganglion
• anterior - motor outputs

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Parts of a Reflex Arc

• Receptor sensitive to a specific change
• Sensory neuron transmits nerve impulse from the
  receptor to brain or spinal cord

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Components of a reflex arc

• Reflex arc has five components
• receptor
• sensory neuron
• integration centre
• motor neuron
• Effector
• Somatic reflex skeletal muscle
• Autonomic reflex smooth muscle, cardiac muscle
  or gland

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Gerilme refleksi
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Stretch-gerilme refleksi ve resiprok inhibisyon

• Muscle spindlestretch of muscle spindle
  generates sensory impulses
• excitation of agonist
• inhibition of antagonist

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Stretch-gerilme refleksi ve resiprok inhibisyon
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Stretch Reflex
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Tendon reflex

• Golgi tendon organs detect tension
• generate sensory impulses
• inhibition of agonist
• excitation of antagonists
• Can override stretch reflex

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Stretch Reflex Patellar Tendon Reflex
Monosynaptic Reflex
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Flexor reflex

• Flexor reflex
• painful stimulus causes withdrawal of threatened
  body part
• overrides other signals using same pathways

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