Figure 6 in Jurassic mammaliaform petrosals from Western Siberia (Russia) and implications for early mammalian inner-ear anatomy

Figure 6. Virtual horizontal cut through the three?haramiyidan promontoria, specimens PIN 5087/37 (A), PIN 5087/69 (B), and PIN 5087/70 (C). Remnants of a bony bar on the medial side of the cochlear nerve foramen are visible in each specimen inside the cochlear canal (indicated by black arrow heads). White rectangle in B depicts area seen close up in D, light source was virtually adjusted in D to make the sulci visible. E, reconstruction of the perforated bony bar with single cochlear nerve fibres (yellow) piercing through; number of holes random and only for illustration purpose. Anterior to the top, not to scale.