Page 334 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Withdrawal reflex
Activated motoneuron Left flexors
Inhibited motoneuron relaxed
Afferent neuron Left extensors
contracted
Right extensors
relaxed
7
Right flexors
6 contracted
5
3
4
2 Polysynaptic Reflexes
1
8
Stimulatory interneuron Nociception in right foot
Inhibitory interneuron
B. Presynaptic inhibition C. Postsynaptic inhibition Plate 12.6
1 Uninhibited
e.g. Ia afferent 1
Feedback
Inhibitory interneuron inhibition 2
Feed-forward
inhibition
Stimulatory transmitter
e.g. α motoneuron

mV
AP
0

s
2 Inhibited
Renshaw
cell
Inhibitory
transmitter
Stimulatory
transmitter
Axon
collaterals Inhibitory
mV interneuron
0

To agonist To antagonist
s (e.g., flexor) (e.g., extensor) 321
SD12.6
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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