The stretch (myotati c) refl ex is a
monosynapti c refl ex. The aff erent
limb originates in the muscle spin-
dle, travels in the spinal nerve and
posterior root, enters the spinal
cord and synapses on an alpha mo-
tor neurone in the anterior horn.
The eff erent limb (the alpha motor
neurone) travels to the neuromus-
cular juncti on and synapses on a
muscle. Transecti on of a peripheral
nerve will abolish its corresponding
refl ex, resulti ng in arefl exia. Damage
to the spinal cord above a refl ex arc
results in destructi on of inhibiti ng
impulses from higher neuronal cen-
tres, resulti ng in hyper-refl exia.
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