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Original ArticleOpen Access
Anatomical Position of the Asterion and Its Underlying Structure
Sripairojkul B 
,
Adultrakoon A
,
Adultrakoon A Surface 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.
Key word
: Asterion, Posterior Fossa, Skull Base Surgery, Anatomy
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.
Key word
: Asterion, Posterior Fossa, Skull Base Surgery, Anatomy
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