Compound muscle action potential recordings (CMAPs) of the biceps brachii muscle upon activation of the musculocutaneous nerve one month following end-to-side neurorraphy (ESN).

<p>Responses were recorded from normal rats (upper panel), phosphate buffer saline (PBS) treated rats (middle panel) and neuregulin β1 (NRG β1) treated rats (lower panel) with stimulus applied above the neurorrhaphy site. Note that NRG β1 effectively promotes nerve regeneration and functional recovery by triggering larger CMAP than that of PBS-treated ones.