Simple reflexes are also known as monosynaptic reflexes, because the excitatory information that enters the sensory neurons only jumps over one synaptic. After crossing one synaptic, the information can reach the motor neuron so that it can transmit the reflex information to the muscle movement.
Monosynaptic reflexes produce simple movements. For example, when the bottom of the knee is hit or knocked by an object. So, the feet automatically move forward.
The Jendrassik maneuver can be used to enhance the hypoactive reflex: the subject is without their hands and performing traction while the tendons in the lower extremities are struck with a hammer. Alternatively, patients can push their knees against each other while the tendons in the upper extremities are tested.
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