Crossed Extensor Reflex

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Presentation transcript:

Crossed Extensor Reflex Process Diagrams Step-by-Step Copyright © 2007 by John Wiley & Sons, Inc.

1 Stepping on a tack stimulates SENSORY RECEPTOR (dendrites of pain-sensitive neuron) in right foot Withdrawal of right leg (flexor reflex)

2 1 + SENSORY NEURON excited Stepping on a tack stimulates SENSORY RECEPTOR (dendrites of pain-sensitive neuron) in right foot Withdrawal of right leg (flexor reflex)

3 2 1 + + Spinal nerve + + Ascending interneurons + Interneurons from other side + + Descending interneurons + + + + 3 Within INTEGRATING CENTER (spinal cord), sensory neuron activates several interneurons 2 SENSORY NEURON excited 1 Stepping on a tack stimulates SENSORY RECEPTOR (dendrites of pain-sensitive neuron) in right foot Withdrawal of right leg (flexor reflex)

4 4 3 2 1 + + Spinal nerve + + MOTOR NEURONS excited Ascending interneurons + Interneurons from other side + + + Descending interneurons + 4 MOTOR NEURONS excited + + + + + 3 Within INTEGRATING CENTER (spinal cord), sensory neuron activates several interneurons 2 SENSORY NEURON excited 1 Stepping on a tack stimulates SENSORY RECEPTOR (dendrites of pain-sensitive neuron) in right foot Withdrawal of right leg (flexor reflex) Extension of left leg (crossed extensor reflex)

4 5 4 3 2 1 + + Spinal nerve + + MOTOR NEURONS excited Ascending interneurons 5 EFFECTORS (extensor muscles) contract, and extend left leg + Interneurons from other side + + Flexor muscles contract and with- drawright leg + + Descending interneurons + + 4 MOTOR NEURONS excited + + + + + + 3 Within INTEGRATING CENTER (spinal cord), sensory neuron activates several interneurons 2 SENSORY NEURON excited 1 Stepping on a tack stimulates SENSORY RECEPTOR (dendrites of pain-sensitive neuron) in right foot Withdrawal of right leg (flexor reflex) Extension of left leg (crossed extensor reflex)