The anatomical relationships and the distance within the asterion, the anterior angle of parietomastoid sutures and the adjacent bone structures were studied with dried skulls.
The length of lines linking root of styloid to the structures under lateral skull base and asterion to the structures in posterior cranial fossa and the angles between these lines and median vector were measured in 40 cranium.
The triangular area formed by asterion, mastoid tip and anterior angle of parieto mastoid suture was the surface projection of the descending portion of the sigmoid sinus.
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