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A: The black arrow indicates a vein on the floor of scala tympani as seen by SEM. A small vessel crossing the perilymphatic space is indicated by the white arrow. B: Higher power view of the area indicated by the black arrow in “A”. Here there is a crack in the tissue revealing RBC’s inside the vein (arrow).

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A: Cross section showing a vessel (arrow) emerging from the edge of the osseous lamina. OC, organ of Corti; ST, scala tympani. B: Scanning micrograph of the under surface of the basilar membrane (BsM) and osseous lamina (OSL). The arrows indicate the spiral vessel beneath the basilar membrane, which is exposed to the perilymphatic space. From Roland PS, Wright C.G. Surgical aspects of cochlear implantation: Mechanisms of insertional trauma. Adv Otorhinolaryngol 2006;64:11-30

Cochlear vasculature as Illustrated by Siebenmann (1894). The arrow indicates the central auditory vein, which when present, may provide collateral venous drainage for the vessels associated with scala tympani.

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Another preparation in which an electrode array was inserted at the time the temporal bone was fresh and unfixed. After fixation and osmium staining, the array was removed from scala tympani. This SEM image shows the surface of the spiral ligament in an area where the array contacted the lateral wall. In the upper portion of the image the spiral ligament tissue is seen to be compressed and marked by grooves produced by the electrode. Below that area the normal porous surface of the spiral

This is a temporal bone which had an implant electrode inserted at the time that the bone was fresh and unfixed. After fixation, osmium staining, and dissection the electrode was removed from scala tympani. “A” shows the apical turn in an area that the electrode did not reach. The arrows indicate normal-appearing venules in the lower part of the spiral ligament. “B” shows an area in the basal turn where the electrode was in contact with the lateral wall immediately below the basilar

Sponsored Programs Administration Document Library Sponsored Programs Administration Page 1 of 3 Document Title: Advance Accounts for Research Awards Document Number: PRPS.GD.2.0 Original date: November 13, 2017 Date Revised: November 13, 2017 Next Review Date: August 22, 2025 Megan G. Marks, Ph.D. Associate Vice