160 deep peroneal nerves in 80 Korean adults were evaluated for presence of accessory deep peroneal nerve. The subjects were 69 men and 11 women.

The presence of accessory deep peroneal nerve was determined by electrodiagnostic techniques

The accessory deep peroneal nerve was seen in 39 nerves in 24 persons. Sexual incidence was 25% in male and 18% in female. Bilateral involvement was seen in 63% of positive cases.

Awareness of this anomalous innervation is important for clinical and electrodiagnostic evaluation.