n.內(nèi)胚葉;內(nèi)胚層
=entoderm.
These epithelial elements arise embryologically from foregut endoderm in the process of bronchial tubular growth. 這些表皮細胞在胚胎學上把源于支氣管生長過程中的前內(nèi)臟叫內(nèi)胚層。