Lower limb Sensory NCS

Nerve	Origin	Active	Reference	Ground	Stimulation	Lat Max (Onset)	Amp. (Min)	NCV (Min)	F Lat. (Max)
Lateral Cutaneous n.	L2, 3	Along a line connecting the ASIS to the lateral border of the patella with the active electrode (A) 17–20 cm distal to the ASIS	3 cm distal to the active electrode	Between active & reference electrode	A- below the inguinal ligament, 1 cm medial to the line between the ASIS and the lateral border of the patella B- above the inguinal ligament 1 cm medial to the ASIS	3 3.6	6 μv
Deep Peroneal	L5	interspace between the 1st and 2nd metatarsal heads	3 cm distal to the active electrode on the 2nd digit	Between active & reference electrode	12 cm proximal to active electrode and just lateral to the extensor hallucis longus tendon	3.7	3.4
Tibial		over the tibial nerve just proximal to the flexor retinaculum	3 cm distal to the active electrode	Between active & reference electrode	14 cm distal to the active recording electrode	3
Saphenous nerve	L3,4	proximal and slightly medial to the tibialis anterior tendon	Slightly anterior to the highest prominence of the medial malleolus	Between active & reference electrode	14 cm proximal to the active electrode deep to the medial border of the tibia.	3.8	2
Sural nerve	S1,2	behind the lateral malleolus	3 cm distal to the active electrode	Between active & reference electrode	14 cm proximal to the active electrode in the midline or slightly lateral to the midline of the posterior lower leg.	3.6	4