In the fetus, arachnoid septations are normally isualized within the cisterna magna and should not be confused with ascular structures ( Fig. 10-4A-B and Fig. 10-4C ).

• 在胎儿，在小脑延髓池中正常可见蛛网膜分隔，不应与血管结构相混淆（图10-4A-B和图10-4C）。