Singh P, Tuli A, Choudhry R, Dhall U, Makwane U K
Department of Anatomy, Lady Hardinge Medical College, 11001 New Delhi, India.
Surg Radiol Anat. 2004 Feb;26(1):46-50. doi: 10.1007/s00276-003-0173-3. Epub 2003 Nov 25.
Morphologically diverse osseous projections were observed on the anterior lip of the sigmoid sulcus in a study conducted on 318 dry unsexed adult human skulls belonging to the Indian race. For convenience of description, this lip was divided into a longer lateral part, a shorter medial part and a junctional angular part having bony attributes characterized into three types, crests (42.9%), plates (22.3%) and bridges (13.5%). The bridges were subtyped into incomplete (11.8%) and complete (1.7%). Crests and plates were present anywhere along this lip, while bridges were confined to the angle. Right and left differences were analyzed, which showed that the above findings were more frequent on the right than the left. Plates showed a higher incidence of variation between right and left sides as compared to crests and bridges. Five cadavers were studied, which showed retinacular bands attached to the projections blending with dura mater over the foramen magnum. It is postulated that these projections are caused by the traction of the fibrous dural bands. Axial CT scan revealed partial and complete osseous bridges spanning the sulcus. These projections are of relevance to surgeons working at the cerebellopontine angle. Their presence has not been reported previously.
在一项对318个属于印度种族的干燥未定性别的成年人类头骨进行的研究中，观察到乙状窦沟前唇上有形态多样的骨性突起。为便于描述，该唇部分为较长的外侧部分、较短的内侧部分和具有骨性特征的连接角部，骨性特征分为三种类型，嵴（42.9%）、板（22.3%）和桥（13.5%）。桥又分为不完全型（11.8%）和完全型（1.7%）。嵴和板沿该唇的任何部位都有，而桥则局限于角部。分析了左右差异，结果显示上述发现右侧比左侧更常见。与嵴和桥相比，板在左右两侧的变异发生率更高。对5具尸体进行了研究，结果显示有视网膜带附着于突起，与枕骨大孔上方的硬脑膜融合。据推测，这些突起是由纤维性硬脑膜带的牵拉引起的。轴向CT扫描显示有部分和完全的骨性桥跨越该沟。这些突起与在桥小脑角工作的外科医生有关。此前尚未有关于它们存在的报道。
