Crossed Extensor Reflex Process Diagrams Step-by-Step Copyright © 2007 by John Wiley & Sons, Inc.
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Crossed Extensor Reflex
Process Diagrams Step-by-Step
Copyright © 2007 by John Wiley & Sons, Inc.
1
Withdrawal of right leg(flexor reflex)
Stepping on a tackstimulates SENSORYRECEPTOR (dendrites ofpain-sensitive neuron) inright foot
1
SENSORYNEURONexcited
Withdrawal of right leg(flexor reflex)
Stepping on a tackstimulates SENSORYRECEPTOR (dendrites ofpain-sensitive neuron) inright foot
2
+
1
+
Ascendinginterneurons
SENSORYNEURONexcited
Spinalnerve
Within INTEGRATING CENTER(spinal cord), sensory neuronactivates several interneurons
Descendinginterneurons
Withdrawal of right leg(flexor reflex)
Stepping on a tackstimulates SENSORYRECEPTOR (dendrites ofpain-sensitive neuron) inright foot
+
+ +
2
3
+
+ +
+ +
+ +
Interneuronsfrom other side
1
+
Ascendinginterneurons
SENSORYNEURONexcited
Spinalnerve
Within INTEGRATING CENTER(spinal cord), sensory neuronactivates several interneurons
MOTORNEURONSexcited
Descendinginterneurons
Withdrawal of right leg(flexor reflex)
Stepping on a tackstimulates SENSORYRECEPTOR (dendrites ofpain-sensitive neuron) inright foot Extension of left leg
(crossed extensor reflex)
MOTORNEURONSexcited
+
+ +
2
3
4
4
+
+ +
+ +
+ +
+
+
+
Interneuronsfrom other side
1
+
Ascendinginterneurons EFFECTORS
(extensor muscles)contract, and extendleft leg
SENSORYNEURONexcited
Spinalnerve
Within INTEGRATING CENTER(spinal cord), sensory neuronactivates several interneurons
MOTORNEURONSexcited
Descendinginterneurons
Withdrawal of right leg(flexor reflex)
Flexor musclescontract and with-drawright leg
Stepping on a tackstimulates SENSORYRECEPTOR (dendrites ofpain-sensitive neuron) inright foot Extension of left leg
(crossed extensor reflex)
MOTORNEURONSexcited
+
+ +
2
3
4
4
5
+
+ +
+ +
+ +
++
+
Interneuronsfrom other side
+
+
+
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