[Anomalies of the mastoid portion of the facial canal and their surgical importance].
Examination of 150 sagittal sections of temporal bone showed that anomalies of mastoid part of facial canal could be divided into 3 groups: abnormal deviations of the vertical portion, the curves or the nerve bifurcation. Deviations of the vertical pathway of facial nerve can be of three types in relation to the frontal plane: the nerve, after its second bend travels towards the tympanic cavity (9 of 150 cases); it curves forward passing through the hypotympanum (1 of 150 cases); it turns backwards in the direction of the sigmoid sinus (15 of 150 cases). Abnormal or supplementary bends were noted in 10% of cases (15 of 150), in more than half of the cases the latter developing 2-3 mm from the second bend, and more rarely in the inferior wall of the tympanic cavity. A bifurcation of the nerve after its second bend was observed in only one case.
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D000328:Adult; D005154:Facial Nerve / Q000002:abnormalities* / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008416:Mastoid
Anomalies de la portion mastoïdienne du canal facial et leur importance chirurgicale.