21. 牙根尖囊腫(radicular cyst)的內襯上皮(lining epithelium)源自下列何者?
(A)口腔黏膜上皮的基底細胞(basal cells)
(B)牙板殘餘上皮(epithelial remnants of dental lamina)
(C)馬拉塞殘餘(rests of Malassez)
(D)退化牙釉上皮(reduced enamel epithelium)

1. 題目解析牙根尖囊腫（radic...