Electrophysiological Response Recorded in the First Dorsal Inerosseous Muscle with Stimulation of the Tibial and Deep Fibular Nerves

Foot intrinsic muscle innervation may demonstrate some variability. The first dorsal interosseous muscle (FDI) is innervated by the deep branch of the lateral plantar nerve (LPN) from the main trunk of the tibial nerve. Contribution from the deep fibular nerve (DFN) may also play a role in the supply of the FDI. It is possible that selective deep branch involvement may occur, and if so, recording from the FDI may prove valuable.