A systematic study of the responses evoked in proximal muscles of the limbs by stimulation of the proximal nerves allows to arrive at certain conclusions valid for the proximal muscles of the upper and lower limbs. These responses are recorded in both monofilar derivation and bifilar derivation in order to establish the characteristics of these two types of derivation. Criteria for a pathological evoked response in the several examined muscles are established. It is shown that in the proximal muscles of the limbs the monosynaptic reflex response of Hoffmann follows closely the motor response and therefore represents a constant danger of misinterpretation of the evoked response.
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