Common peroneal nerve splits into the deep and superficial peroneal branches. 

Tibialis anterior – deep peroneal nerve 

Peroneus longus muscle – superficial peroneal nerve

Signs of acute denervation = fibrillations and positive waves 
– takes 7-10 days to develop after injury

Signs of chronic denervation = high amplitude, increased duration, and polyphasic MUAPs
– takes 3 months to develop after injury