SI：中间层

“Stratum Intermedium”是医学领域中常用的专业术语，尤其在英国医学文献和教学中较为常见，通常被缩写为“SI”，以便在书写和日常交流中更加便捷。该术语的中文释义为“中间层”，主要用于描述组织结构中的特定层次，多见于组织学和解剖学相关内容的表述。

It was expressed focally in the oral epithelium, dental lamina, outer enamel epithelium, stratum intermedium and stellate reticulum at cap and bell stages.
结果：COX-2在牙胚发育期间存在特异的时空分布模式，其阳性表达主要在牙胚发育帽状期、钟状期的口腔上皮、牙板上皮、外釉、中间层(SI)和星网状层。
In bell stage ( E19 ), the positive staining was detected in both inner and outer enamel epithelium, but the inner was less than that of the outer and less positive staining was also found in the cells of stratum intermedium and stellate reticulum.
钟状期（胚胎19d），内、外釉上皮阳性表达，但内釉上皮较外釉上皮表达弱，中间层(SI)及星网状层细胞弱阳性表达；
CONCLUSION : At onset of HERS, the inner enamel epithelium, outer enamel epithelium embrace several cells with developed cytoplasmic organelles, which may derive from stratum intermedium or stellate reticulum, and form a structure like enamel organ, which may be associated with initial cementogenesis.
结论：上皮根鞘发生时，内、外釉上皮间可包容个别源于网状层或中间层(SI)、细胞器丰富的细胞，从而形成类似成釉器的结构。

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