Cover legend: This differential-interference-contrast image overlain with fluorescence images shows sensory (green) and motor (red) neuron innervation in newborn mouse cochlea. By the day of birth, sensory projections from spiral ganglion neurons and motor neurons have extended from the brain to the organ of Corti through “fanned” radial bundles. While motor neuron axons terminate below inner hair cells at this stage, sensory neurons contact inner and outer hair cells. For more information, see the article by Druckenbrod and Goodrich (pages 16221–16235).