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Facial Nerve Axotomy in Mice: A Model to Study Motoneuron Response to Injury

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Morphometric analysis of anatomical relationships of the facial nerve for mastoid surgery.

A Aslan¹, C Goktan, M Okumus

¹Department of Otorhinolaryngology, Celal Bayar University School of Medicine, Manisa, Turkey. asimas98@yahoo.com

The Journal of Laryngology and Otology

|June 29, 2001

Summary

This study measured facial nerve (FN) distances to key mastoid surgery landmarks in 180 temporal bones. Findings reveal average distances and variations based on bone pneumatization and side, crucial for surgical safety.

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Area of Science:

Anatomy
Radiology
Neurosurgery

Background:

The facial nerve (FN) is critical in mastoid surgery.
Understanding its anatomical relationship with surrounding structures is vital for preventing injury.

Purpose of the Study:

To quantitatively assess the surgical anatomical relationships of the facial nerve (FN) with critical landmarks in the temporal bone.
To analyze these relationships in relation to mastoid pneumatization and side differences.

Main Methods:

High-resolution computed tomography (CT) scans of 90 patients (180 temporal bones) were analyzed.
Shortest distances between the FN and external auditory canal (EAC), sigmoid sinus (SS), posterior fossa dural plate (PFD), and mastoid-EAC junction (M) were measured.
Measurements were correlated with the degree of bone pneumatization and laterality.

Main Results:

Average distances: FN-EAC 2.9 mm, FN-SS 10.5 mm, FN-PFD 7.3 mm, FN-M 15.3 mm.
FN-EAC distance was greater in poorly pneumatized temporal bones.
Other distances (FN-SS, FN-PFD, FN-M) were greater in well-pneumatized bones.
The FN-M distance was significantly longer on the right side.

Conclusions:

Provides precise quantitative data on facial nerve distances to key surgical landmarks.
Highlights the influence of pneumatization and side on these anatomical relationships.
Essential reference for surgeons performing mastoid procedures to enhance safety and minimize FN injury risk.