Anatomical Study of the Facial Recess with Implications in Round Window Visibility for Cochlear Implantation: Personal Observations and Review of the Literature

Shraddha Jain; PT Deshmukh; Pooja Lakhotia; Sanika Kalambe; Deepshikha Chandravanshi; Mohnish Khatri

doi:10.1055/s-0038-1676100

International Archives of Otorhinolaryngology, Table of Contents

CC BY-NC-ND 4.0 · Int Arch Otorhinolaryngol 2019; 23(03): e281-e291
DOI: 10.1055/s-0038-1676100

Original Research

Thieme Revinter Publicações Ltda Rio de Janeiro, Brazil

Anatomical Study of the Facial Recess with Implications in Round Window Visibility for Cochlear Implantation: Personal Observations and Review of the Literature

Shraddha Jain

¹Department of Otorhinolaryngology, Datta Meghe Institute of Medical Sciences (Deemed to be University), Jawaharlal Nehru Medical College, Maharashtra, India

,

PT Deshmukh

¹Department of Otorhinolaryngology, Datta Meghe Institute of Medical Sciences (Deemed to be University), Jawaharlal Nehru Medical College, Maharashtra, India

,

Pooja Lakhotia

¹Department of Otorhinolaryngology, Datta Meghe Institute of Medical Sciences (Deemed to be University), Jawaharlal Nehru Medical College, Maharashtra, India

,

Sanika Kalambe

¹Department of Otorhinolaryngology, Datta Meghe Institute of Medical Sciences (Deemed to be University), Jawaharlal Nehru Medical College, Maharashtra, India

,

Deepshikha Chandravanshi

¹Department of Otorhinolaryngology, Datta Meghe Institute of Medical Sciences (Deemed to be University), Jawaharlal Nehru Medical College, Maharashtra, India

,

Mohnish Khatri

¹Department of Otorhinolaryngology, Datta Meghe Institute of Medical Sciences (Deemed to be University), Jawaharlal Nehru Medical College, Maharashtra, India

› Author Affiliations

Abstract

Introduction Posterior tympanotomy through facial recess (FR) is the conventional and most preferred approach to facilitate cochlear implantation, especially when the electrode is inserted through the round window. The complications of the FR approach can be minimized by proper understanding of the anatomy of the FR.

Objective The present study was undertaken to assess the various parameters of FR and round window visibility, which may be of relevance for cochlear implant surgery.

Methods Thirty-five normal wet human cadaveric temporal bones were studied by dissection for anatomy of FR and posterior tympanum. Photographs were taken with an 18 megapixels digital camera, which were then imported to a computer to determine various parameters.

Results The mean distance from the take-off point/crotch of the chorda tympani nerve (CTN) to the stylomastoid foramen was 4.08 ± 0.8 mm (range of 2.06 - 5.5 mm). The variations in the course of the CTN included origin at the level of the lateral semicircular canal. The mean chorda-facial angle in our study was 26.91° ± 1.19°, with a range of 25° to 28.69°. The mean FR length ranged between 9.4 mm and 18.56 mm (mean of 12.41 ± 2.91mm) and varied with the origin of the CTN and pneumatization of temporal bone. The average maximum width of the FR was 2.93 ± 0.4 mm (range 2.24–3.45 mm) and the mean width of the FR at the level of the round window was 2.65 ± 0.41 mm.

Conclusion The FR approach provides good access to the round window membrane in all cases. In some cases, table adjustment is required.

Keywords

facial nerve - round window membrane - cochlear implantation - chorda tympani nerve

Full Text

References

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