“…The SV contacts the OW membrane (OWM) and the ST contacts the RWM (Fernández, 1952; Salt et al, 2012a, b; Felten et al, 2016). SV is contiguous with ST, converging at the apex, at the helicotrema (Fernández, 1952; Salt et al, 1991; Felten et al, 2016; Wright and Roland, 2018). At the basal end the SV is contiguous with the vestibule while the ST ends at the RWM (Figure 1).…”