Table 1.

Placement methods for stimulation and recording electrodes and natural values of amplitude, latency and NCV for motor and sensory nerves of the upper and lower limbs

Nerve conduction study	Stimulation site	Recording site	Amplitude	Onset latency (ms) site 1	Conduction velocity (m/s)
Median motor response	The wrist, somewhere between the palmaris longus and flexor carpi radialis tendons, 7 cm proximal to recording site (active electrode)	The abductor pollicis brevis muscle	≥4 mv	≤4.4	-
Ulnar motor response	The wrist, next to the tendon of the flexor carpi ulnaris muscle, 7 cm proximal to recording site (active electrode)	The abductor digiti minimi muscle	≥6 mv	≤3.3	-
Tibial motor response	Site 1: The medial side of the ankle, higher and behind the medial malleolus, 9 cm proximal to the recording site (active electrode); site 2: the middle section of the popliteal region, on the popliteal pulse	The abductor hallucis muscle	≥4 mv	≤5.8	≥41
Deep peroneal motor response	Site 1: The ankle, slightly lateral to the tendon of the tibialis anterior muscle, 9 cm proximal to the recording site (active electrode); site 2: under the head of the fibula, one or two fingerbreadths lower	The extensor digitorum brevis muscle	≥2 mv	≤6.5	≥44
Median sensory response	Site 1: the wrist, somewhere between the palmaris longus and flexor carpi radialis tendons, 14 cm proximal to active electrode; site 2: the palm, 7 cm proximal to the recording site (active electrode)	Palmar surface of the middle finger	≥20 μv	≤3.5	≥50
Ulnar sensory response	The medial side of the wrist, next to the tendon of the flexor carpi ulnaris muscle, 11 cm proximal to the recording site (active electrode)	Palmar surface of the 5th finger	≥17 μv	≤3.1	-
Sural sensory response	Posterior leg, 14 cm more proximal from the recording site, somewhere between the posterior and lateral section of the calf muscle	Behind the lateral malleolus	≥6 μv	≤4.4	-

mV: millivolt; ms: millisecond; m/s: meter/second; μv: microvolt