Day J D, Tschabitscher M
Department of Neurosurgery, Lahey Hitchcock Medical Center, Burlington, Massachusetts, USA.
Neurosurgery. 1998 Jan;42(1):198-9. doi: 10.1097/00006123-199801000-00045.
The asterion is defined as the junction of the lambdoid, parietomastoid, and occipitomastoid sutures. The asterion has been used as a landmark in lateral approaches to the posterior fossa. However, its reliability as a landmark comes into question considering the apparent variability of its position. This study was performed to determine the reliability of the asterion as a surgical landmark.
One hundred dried skulls were obtained for study. A 2-mm drill hole was placed at the asterion on each side. The position of the drill hole on the inner surface of the skull was next determined and recorded.
The asterion was located over the posterior fossa dura in 32% on the right and 25% on the left. Its position was over the transverse or sigmoid sinus complex in 61% on the right and 66% on the left. The landmark was located above the transverse-sigmoid sinus complex in 7% on the right and 9% on the left.
The asterion is not a strictly reliable landmark in terms of locating the underlying posterior fossa dura. Its location is very often directly over the transverse-sigmoid sinus complex. Burr holes placed at the asterion may often open the bone directly over the sinus, leading to potential damage.
星点被定义为枕乳缝、顶乳缝和枕颞乳突缝的交汇处。星点在颅后窝外侧入路中被用作一个标志。然而，考虑到其位置明显的变异性，其作为标志的可靠性受到质疑。本研究旨在确定星点作为手术标志的可靠性。
获取100个干燥颅骨用于研究。在每侧星点处钻一个2毫米的钻孔。接下来确定并记录钻孔在颅骨内表面的位置。
星点位于颅后窝硬脑膜上方的，右侧为32%，左侧为25%。其位置在横窦或乙状窦复合体上方的，右侧为61%，左侧为66%。该标志位于横窦-乙状窦复合体上方的，右侧为7%，左侧为9%。
就定位下方的颅后窝硬脑膜而言，星点不是一个严格可靠的标志。其位置常常直接在横窦-乙状窦复合体上方。在星点处钻的骨孔可能常常直接打开窦上方的骨质，从而导致潜在损伤。
