A collection of fragments of understanding in the pursuit of deeper questions.
Intrafusal Motor Neurons
The Gamma Motor Neuron makes sure that the intrafusal muscles show always a state of tension to exert a reaction when needed (e.g., the previous cat).
Remember that muscles work in pairs, so if one contracts the other relaxes. This is referred to as Reciprocal Innervation. What if both muscles contracted at the same time?
Reciprocal Innervation of Antagonistic Muscles & The Elicitation of a Stretch Reflex
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Neurologist often measure this reflex because the presence of such reflex indicates a functioning spinal cord.