Series of images progressively increasing in thickness from 100 μm (a) to 250 μm (b) to 500 μm (c). Note changes in anatomical details observable as thickness and relative depth increase, such as spiral ganglion cells (SGC) within Rosenthal’s canal (a) as they expand to form their spiraling structure (hollow arrow heads in b and c). Solid arrowhead points to the same vessel in a-c; solid arrows indicate the vascular bed within the modiolus. Scale in b same for c. Aud Nv, auditory nerve; IHC, inner hair cells; OHC, outer hair cells; osl; osseous spiral lamina; sl, spiral ligament; sv, stria vascularis.