Anatomical Position of the Asterion and Its Underlying Structure

BOONLERT SRIPAIROJKUL, M.D.*, ARAYA ADUL TRAKOON, M.Sc. **

Affiliation : * Division of Neurological Surgery, Department of Surgery, Faculty of Medicine, ** Department of Anatomy, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.

AbstractSurface anatomy is important for surgical planning. The asterion has been believed and used for locating the underlying posterior fossa dura. To prove whether this landmark is reliable or not, forty-three fixed heads of cadaver were dissected. A burr hole was made on the asterion and its underlying structure was examined. Seventy-four point four per cent (7 4.4%) of the asterion on the right side were adjacent to the transverse-sigmoid sinus complex when compared to 58.1 per cent on the left. Twenty-three point three per cent (23.3%) of the asterion on the right side were found over the infratentorial dura while that on the left side were 32.6 per cent. Two point three per cent (2.3%) of the asterion were located over the supratentorial dura on the right and 9.3 per cent on the left side. It is concluded, therefore, that the asterion is not an appropriate landmark to locate the underlying posterior fossa dura.

Keywords : Asterion, Posterior Fossa, Skull Base Surgery, Anatomy

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