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H, T, and Masseter Reflexes and the Silent Period 

H, T, and Masseter Reflexes and the Silent Period
H, T, and Masseter Reflexes and the Silent Period

Jun Kimura

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date: 28 October 2021

Conventional nerve conduction studies primarily assess the distal segments of the peripheral nerves. Techniques to test the more proximal segments and the spinal cord include, in addition to F wave and the blink reflex, H reflex, T reflex, tonic vibration reflex, and the silent period. The reflex studies reveal conduction characteristics and excitability of the sensory and motor axons. This chapter reviews their basic mechanisms and possible diagnostic application in evaluating the regions of the nervous system not accessible by the conventional methods. Extensive studies have proven the practical value of the H and T reflexes in certain neurologic disorders. The other techniques mentioned here await further confirmation as a clinical test, although they have contributed substantially to physiologic understanding of the motor and sensory systems.

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