Study of variations of facial nerve in tympanomastoid segment course in 50 cadavar temporal bone dissection
Journal Title: Medpulse International Journal of ENT - Year 2019, Vol 9, Issue 2
Abstract
Background: Facial nerve is the longest nerve in a bony canal. Three dimensional anatomical knowledge provides the foundation for safe and skilful dissection of the very complex temporal bone and tortuous facial nerve. Objectives: This study aimed to see the variations of facial nerve in tympanomastoid segment course in 50 cadavaric temporal bone dissection in the tertiary care hospital. Material and Methods: The present cross observational study was carried out from October 2009 to October 2011. Preserved 50 temporal bones were obtained for the study and dissection was carried out on wet temporal bone in temporal bone laboratory. Modified radical mastoidectomy procedure was done. Lateral sinus plate, bony horizontal semicircular canal, digastric ridge exposed and identified. Facial nerve and its relations with the important middle ear structures and their anomalies with the help of various equipment was seen. Results: Out of 50 bones dissected, 44 (88%) bones were well pneumatised and 6(12%) bones were sclerotic. Length of the tympanic segment varied from 7.8-11.88 mm with a mean of 9.47 mm (±1.06mm). In 20 bones (40%) the length of the tympanic segment was 8.6-9.5 mm. The length of mastoid segment varied from 10 to 16 mm, with a mean of 13.59 mm (±1.27 mm. In 17 bones (34 %) length of the mastoid segment was 13.1-14 mm. The distance of second genu from outer cortex varied from 17.87 -23.67 mm with a mean of 19.64 mm (± 1.42 mm). The distance of second genu from outer cortex was 18.6-19.5 mm in 14 bones (28%) each. Distance of chorda tympani from stylomastoid foramina varied from 3.4-7.8 mm with a mean of 5.69 mm (±1.51mm). Conclusions: The study has provided knowledge of anatomy of temporal bone and its pneumatisation pattern, the anatomy of the facial nerve, its variations and their incidence, relation of various middle ear landmarks with the facial nerve and proficiency in dissection.
Authors and Affiliations
Sonali Uttamrao Landge, Prafful V Jatale, Vilas Kirdak, Kaleem Shaikh
Keywords
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- EP ID EP467821
- DOI 10.26611/1016922
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