To study synapses in the peripheral nervous system, Eccles and colleagues used the stretch reflex as a model, which is easily studied because it consists of only two neurons: a sensory neuron (the muscle spindle fibre) and the motor neuron.
Eccles and colleagues used the stretch reflex as a model. This was to study synapses in the peripheral nervous system. Because it consists of only two neurons: a sensory neuron (the muscle spindle fibre) and the motor neuron. This was what a model is easily studied.