Ucerler Hulya, Govsa Figen
Department of Anatomy, Faculty of Medicine, Ege University, Izmir, Turkey.
J Craniomaxillofac Surg. 2006 Oct;34(7):415-20. doi: 10.1016/j.jcms.2006.05.003. Epub 2006 Sep 11.
When approaching the posterior fossa and posterolateral cranial base, surface landmarks are helpful in locating the junction of the transverse and the sigmoid sinus.
On 100 skull halves a 2mm drill bit was externally placed over the asterion and was drilled through the bone perpendicular to the skull surface. Various positions of the asterion and its distance from the root of the zygomatic process of the temporal bone, from the suprameatal crest and the mastoid tip were investigated.
The position of the asterion has been found to be located superficial to the transverse-sigmoid sinus junction in 87% of all samples, inferior to the transverse-sigmoid sinus junction in 11% and superior to the transverse-sigmoid sinus junction in 2%. The distance from the asterion to the root of the zygoma has been determined to be 54.6+/-5.5mm. The distance between asterion and Henle's spine was 45.2+/-5.2, and from asterion to Frankfurt Horizontal Plane 15+/-7.5mm.
Asterion varies regarding its cephalocaudal position. The findings of this study might have direct consequences for transmastoid and retrosigmoid approaches for microvascular trigeminal root decompression and combined petrosal approaches.
在处理后颅窝和颅后外侧底部时,表面标志有助于确定横窦和乙状窦的交界处。
在100个颅骨半侧标本上,将一个2毫米的钻头置于星点外侧,垂直于颅骨表面钻孔。研究了星点的不同位置及其与颞骨颧突根部、外耳道上嵴和乳突尖的距离。
在所有样本中,87%的星点位于横窦-乙状窦交界处的浅面,11%位于其下方,2%位于其上方。已确定星点到颧骨根部的距离为54.6±5.5毫米。星点与亨氏棘之间的距离为45.2±5.2毫米,从星点到法兰克福水平面的距离为15±7.5毫米。
星点的头尾位置存在差异。本研究结果可能对微血管三叉神经根减压的经乳突和乙状窦后入路以及联合岩骨入路有直接影响。