Lmx1a and Lmx1b are Redundantly Required for the Development of Multiple Components of the Mammalian Auditory System

•Combined loss of Lmx1a/b disrupts auditory inner ear development, preventing formation of the organ of Corti.•Loss of Lmx1a and Lmx1b leads to milder inner ear vestibular innervation abnormalities.•In Lmx1a/b double mutants, vestibular afferents aberrantly project to the hindbrain dorsal midline.•Combined loss of Lmx1a/b prevents the development of excitatory neurons of cochlear and vestibular nuclei.