Follicular cells which pile up as a tougue in the granular layer come to insert into egg membrane, and make the zona rediata undulate.This kind is called inlayed-folicle.

• 颗粒层滤泡细胞互相堆积成舌状镶嵌入卵膜，并使放射带凹凸不平，称为镶嵌型滤泡。