Osman A H, Berg R
Anat Anz. 1981;150(5):516-20.
In the fetus with 9 cm CRL the reticular mucosa was made up of a Lamina epithelialis and a Lamina Propria/submucosa. The primordia of the reticular crests firstly appeared in the fetus with 16 cm CRL as evaginations of the basal zone of the Lamina epithelialis into the superficial one. Invaginations from the luminal surface of the Lamina epithelialis above the tips of the long reticular crests were formed in the fetus with 27 cm CRL. Aggregations of smooth muscle cells appeared in the cores of the long reticular crests in the fetus with 50 cm CRL. In the fetus with 73 cm CRL invaginations of various depths were formed to separate the reticular crests from the mass of epithelium. The epithelium in the different fetal stages were missing a Stratum corneum.
头臀长9厘米的胎儿，其网状黏膜由上皮层和固有层/黏膜下层组成。网状嵴原基最初出现在头臀长16厘米的胎儿中，表现为上皮层基底部向浅层的突起。头臀长27厘米的胎儿，在长网状嵴顶端上方的上皮层腔面形成内陷。头臀长50厘米的胎儿，长网状嵴的核心出现平滑肌细胞聚集。头臀长73厘米的胎儿，形成了不同深度的内陷，将网状嵴与上皮团块分开。不同胎儿阶段的上皮均无角质层。
