Long latency reflexes (LLR) are polysynaptic exteroceptive responses. In the present study Motor responses were simultaneously recorded over the biceps brachii (BB) and abductor digiti minimi (ADM) muscles of 14 volunteers after ipsilateral supramaximal stimulation of the superficial radial nerve. The nerve was challenged with 0,3 Hz or 1,0 Hz. single stimuli and with trains of 2, 3, 4, 5 and 7 stimuli. Over the biceps brachii (BB) two constant excitatory long latency reflexes (LLR2, 3) and two inconstant reflexes (LLR1,4) were observed, while over the ADM an LLR2 and an inconstant LLR3 reflex were detected. Furthermore, prominent long latency reflexes (LLR2k, 3k) were only recorded on the contralateral side to the stimulus over the BB. The data shows that LLR amplitudes and latencies were significantly facilitated by increasing the number of stimuli per train compared with single stimuli due to temporal summation. Furthermore LLR obtained with 1,0 Hz compared with 1,0 Hz showed that amplitudes and peak latencies decreased after stimulation with higher frequencies. This seems to be due to habituation. Taken together, LLR can be significantly facilitated by temporal summation of afferent sensory stimuli. Facilitation of LLR could be usefull to disclose diseases of the pyramidal or extrapyramidal motor systems in order to elucidate mechanisms of normal or abnormal amplification or depression of information flow at the sensory-motor interface.