The patellar reflex is a clinical and classic example of the monosynaptic reflex arc. There is no interneuron in the pathway leading to flexion of the quadriceps muscle. Instead the bipolar sensory neuron synapses directly on a motor neuron in the spinal cord. However, there is an inhibitory interneuron used to relax the antagonistic hamstring muscle.
The absence or decrease of this reflex is known as Westphal's sign.
Chronic Flexibility Gains: Effect of Isometric Contraction Duration during Proprioceptive Neuromuscular Facilitation Stretching Techniques. (Physiology)
Mar 01, 2003; The aim of this study was to assess the effect of two isometric contraction durations during proprioceptive neuromuscular...
Acute Effects of Static Stretching, Proprioceptive Neuromuscular Facilitation Stretching, and Maximum Voluntary Contractions on Explosive Force Production and Jumping Performance
Sep 01, 2001; Key words: warm-up, muscular power, stretch-shortening cycle Warm-up prior to physical activity is a well accepted practice...