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Vol. 16. Issue 5.
Pages 441-446 (January 2005)
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Vol. 16. Issue 5.
Pages 441-446 (January 2005)
Anatomía topográfica del asterion
Topographyc anatomy of the asterion
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F. Martínez*,**,
, A. Laxague*, L. Vida*, H. Prinzo*,**, N. Sgarbi**, V.R. Soria*, C. Bianchí***
* Departamento de Anatomía Humana Normal. Hospital Pereira Rossell. Montevideo. Uruguay
** Facultad de Medicina. Departamento de Neurocirugía. Hospital Pereira Rossell. Montevideo. Uruguay
*** Hospital de Clínicas Dr, Manuel Quintela. Facultad de Medicina, Servicio de Otorrinolaringlogía. Hospital Pereira Rossell. Montevideo. Uruguay
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Resumen
Introducción

Las referencias anatómicas que permiten ubicar los senos venosos durante los abordajes de fosa posterior, son de utilidad para el neurocirujano. El asterion es usado como referencia para localizar cl seno transverso (ST).

Material y método

Se utilizaron 50 hemicráneos de cadáveres adultos. Se estudió la relación del asterion con el ST, la vena emisaria mastoidea (VEM), la cresta suprameatal y el inion.

Resultados

Se identificó el asterion en 49 casos. En el 87.8% de las piezas, se situó a la altura del seno transverso. El 72.2% se ubicó sobre el propio seno y el 27.8% sobre su codo. Si se traza una línea desde la cresta suprameatal al inion, el asterion se ubica por debajo de esta línea en el 88% de los casos.

El foramen de la VEM se identificó en 46 oportunidades, en el 36% fue doble.

Discusión y conclusiones

Según nuestros datos y los de otros autores, el orificio de trépano debe situarse por debajo y algo detrás del asterion para evitar la lesión del seno transverso.

Palabras clave:
Asterion
Fosa posterior
Seno transverso
Seno lateral
Vena emisaria mastoidea
Abreviaturas:
POE
CSM
VEM
SL
SS
Abstract
Background

In the surgical approaches to the posterior fossa, the accurate location of the transverse-sigmoid sinus (TS-SS) complex is of great importance. The asterion is a referal landmark to the transverse sinus location.

Method

Twenty-Iive skulls of adult cadavers were studied. We seek for the relationships of the asterion with: TS location, mastoid emissary vein, suprameatal

crest and inion.

Results

The asterion was found in 49 cases. In the great majority of cases (87.8%) the asterion was over the TS (72.2% over the sinus proper, 27.8% over the TS-SS transition).

The mastoid emissary vein was present in 46 cases, and in 36% we found two veins.

Discussion and conclusions

The burr hole for posterolateral approaches to the posterior fossa must be located below and behind the asterion.

Key words:
Asterion
Posterior fossal
Transverse sinus
Lateral sinus
Mastoid emissary vein

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