Movie S1.

Movie scanning through a representative FIB-SEM z-stack of a P15 IHC, showing 3D reconstruction of the basolateral IHC contour, part of the nucleus, mitochondria, innervating nerve fibers, synaptic ribbons and their corresponding SVs. The movie starts at the nuclear region and extends towards the base of the cochlear IHC. Higher resolution of this video can be found using this link: http://www.innerearlab.uni-goettingen.de/materials.html