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Vol. 58. Issue 5.
Pages 178-181 (January 2007)
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Vol. 58. Issue 5.
Pages 178-181 (January 2007)
Morphometric Study of the Mastoid Segment of the Facial Nerve
Estudio morfométrico del tercer segmento del nervio facial
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Rafael L. Boemoa,
Corresponding author
mlna@telefonica.net

Correspondence: Balmes, 434, 1.° A. 08022 Barcelona. España.
, M. Luisa Navarretea, Félix Pumarolaa, J. Quesadaa, José M. Doménechb, Enrique Perellóa
a Servicio de Otorrinolaringología, Hospital General Vall d'Hebron, Universidad Autónoma de Barcelona, Barcelona, Spain
b Cátedra de Anatomía y Ciencias Morfológicas, Universidad Autónoma de Barcelona, Barcelona, Spain
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Objective

Our study emphasizes the relationship between the temporal bone structures and the mastoid portion of the facial nerve.

Material and methods

Thirty-two temporal bones taken from adult cadavers of both sexes subjected to tympanoplastic procedure were used to make reference measures of the mastoid portion of the facial nerve. Appropriate instruments were used for measurement and statistic analysis was subsequently performed.

Results

The digastric ridge presented a positive correlation with the stylomastoid foramen in comparison with the sigmoid sinus (P=.03). There was a correlation between the position of the short apophysis of the incus and the position of the facial nerve (P=.001). The distance from the sigmoid sinus to the mastoid portion of the facial nerve presents a positive linear relationship throughout its length (P<.001). The tympanic membrane presented a positional correlation with the distal portion of the facial nerve (P<.008).

Conclusions

The mastoid portion of the facial nerve is proportional to reference structures in the temporal bone and this may help us to define measures prior to surgical otologic procedures.

Key words:
Facial nerve
Morphometry
Temporal bone
Objetivo

Enfatizamos en este estudio la relación entre las estructuras de referencia del hueso temporal y su relación con la tercera porción del nervio facial.

Material y método

Nuestro estudio se ha realizado con 32 huesos temporales humanos, provenientes de cadáveres de adultos de ambos sexos a los que se practicó timpanoplastia con el objetivo de hacer mediciones de referencia de la porción mastoidea del nervio facial. Luego se las midió con instrumentos adecuados y se practicó análisis estadístico.

Resultados

La cresta digástrica presenta una relación positiva con el agujero estilomastoideo en relación con el seno sigmoideo (p=0,03). Existe relación entre la posición de la apófisis corta del yunque y la posición del nervio facial (p<.0,001). La distancia del seno sigmoideo respecto a la tercera porción del nervio presenta una relación lineal positiva por todo su recorrido (p<0,001). La membrana timpánica presenta una relación de posición con la porción distal de nervio facial (p<0,008).

Conclusiones

La porción mastoidea del nervio facial presenta relación proporcional con estructuras de referencia del hueso temporal, lo que nos ayudará a definir medidas previas a intervenciones quirúrgicas otológicas.

Palabras clave:
Nervio facial
Morfometría
Hueso temporal

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