During development of the avian lung, the initially terminally branched epithelial tree later forms a continuous network of airways. This occurs via a large‐scale epithelial fusion event, wherein airways that originate proximally collide with those that originate distally to form one continuous lumen.

中文翻译：

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禽肺发育过程中气道的融合构成了多细胞上皮形成连续腔的新机制。

在禽肺的发育过程中，最初末端分支的上皮树后来形成了连续的气道网络。这是通过大规模上皮融合事件发生的，其中起源于近端的气道与起源于远端的气道碰撞形成一个连续的管腔。