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Surgical and Radiologic Anatomy

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20.01.2018 | Original Article

The variable position of the inferior alveolar nerve (IAN) in the mandibular ramus: a computed tomography (CT) study

verfasst von: Andrew Y.E. Yeh, Brian P. Finn, Robert H. B. Jones, Alastair N. Goss

Erschienen in: Surgical and Radiologic Anatomy | Ausgabe 6/2018

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Abstract

Introduction

This study was designed to quantify the important anatomical landmarks and the path of the inferior alveolar nerve (IAN) within the human mandibular body and ramus, in particular with reference to the bilateral sagittal split osteotomy (BSSO).

Materials and methods

Four hundred and eleven CT scans were studied, 299 of these were involved in determining the position of lingula; and 230 were involved in determining the course of IAN in the mandibular molar region, namely from the mesial of the mandibular first molar to the distal of the mandibular second molar; 118 were involved with both measurements.

Results

On average, the lingula was located 17.0 ± 2.2 mm from the external oblique ridge; 11.6 ± 2.0 mm from the internal oblique ridge; 17.2 ± 2.7 mm from the sigmoid notch; and 15.6 ± 1.9 mm from the posterior border of the mandible. The course of the IAN in the mandibular molar region was found to descend vertically from the distal of the mandibular second molar (7) to reach its lowest point between the first and second molars (6 and 7), and then ascend towards the mesial of the first molar (6). Horizontally, the IAN was found to traverse medially between the distal of the 7 and the middle of the 7, and then changes its path laterally towards the mesial of the 6.

Conclusion

Precise knowledge of the individual’s position of the IAN will help surgical planning.

Due to the presence of IAN bifurcation loop in one of the male patient studied. For statistical purpose, this patient had the IAN-BB and TBC counted twice, while the IAN-IBM and TIBC only counted once—lower part of the loop.

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Titel: The variable position of the inferior alveolar nerve (IAN) in the mandibular ramus: a computed tomography (CT) study
verfasst von: Andrew Y.E. Yeh
Brian P. Finn
Robert H. B. Jones
Alastair N. Goss
Publikationsdatum: 20.01.2018
Verlag: Springer Paris
Erschienen in: Surgical and Radiologic Anatomy / Ausgabe 6/2018
Print ISSN: 0930-1038
Elektronische ISSN: 1279-8517
DOI: https://doi.org/10.1007/s00276-018-1973-9

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The variable position of the inferior alveolar nerve (IAN) in the mandibular ramus: a computed tomography (CT) study

Abstract

Introduction

Materials and methods

Results

Conclusion

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Abstract

Introduction

Materials and methods

Results

Conclusion

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