Lithium accelerates functional motor recovery by improving remyelination of regenerating axons following ventral root avulsion and reimplantation

•Lithium promotes motor neuron outgrowth in ventral root avulsion and reimplantation.•Lithium enhances the remyelination of the regenerated axons.•Lithium accelerates functional recovery through enhanced remyelination.•Lithium is beneficial for the treatment of brachial plexus injury.