Schmidt W, Klima G
Institut für Histologie und Embryologie, Universität Innsbruck.
Zentralbl Gynakol. 1989;111(3):129-41.
The collagen microfibrils of the amniotic connective tissue are irregularly textured. In all a preference for a meridional orientation perpendicular to the placental-rim can be observed. There are randomly dispersed weak spots between dense bundles of collagen fibres. The chorion connective tissue consists also of fibril bundles in a meridional main orientation. Within the bundles or bands there is an unmistakable pattern of latticed arranged fibrils. The framework receives its stability from the bundles that run perpendicular or inclined to the previously mentioned bundles. There are randomly dispersed weak areas between the dense fibril aggregates. In general the amniotic and chorionic connective tissues are both of variable strength. The tensile strength of both membranes is regionally varying due to the irregular texture. At times it varies within the same fetal membrane or from fetal membrane to fetal membrane considerably, where by the variation in membrane thickness also is of influence. It is to be observed that in general the resistance perpendicular to the meridian direction is smaller than along the meridian direction. During the rupture of the membranes the latticed arranged fibres from the bundles of the chorionic connective tissue give way and tear in an arbitrary weak spot. In the amniotic tissue the tearing also begins in a weak spot and continues to tear in a non predictable direction between the irregular pattern of bundles.
羊膜结缔组织的胶原微纤维质地不规则。总体上，可以观察到其倾向于垂直于胎盘边缘的经线方向排列。在密集的胶原纤维束之间存在随机分布的薄弱点。绒毛膜结缔组织也由主要沿经线方向排列的纤维束组成。在这些纤维束或带内，有明显的晶格状排列的纤维模式。该结构框架的稳定性来自于与上述纤维束垂直或倾斜排列的纤维束。在密集的纤维聚集体之间存在随机分布的薄弱区域。一般来说，羊膜和绒毛膜结缔组织的强度都是可变的。由于质地不规则，两层膜的抗张强度在区域上有所不同。有时，在同一胎膜内或不同胎膜之间，其抗张强度变化很大，胎膜厚度的变化也会产生影响。需要注意的是，一般来说，垂直于经线方向的阻力小于沿经线方向的阻力。在胎膜破裂过程中，绒毛膜结缔组织纤维束中晶格状排列的纤维在任意一个薄弱点处屈服并撕裂。在羊膜组织中，撕裂也始于一个薄弱点，并在不规则排列的纤维束之间沿不可预测的方向继续撕裂。
