0 one of the many very small air bags in the lungs, with thin walls that allow oxygen to enter the blood -- 肺泡（肺中的细小气囊，细胞壁薄，有助于氧气进入血液）
However, surgery to close the alveolus and palate has been linked with poor facial growth.
There is some evidence for small interdental plates dividing adjacent alveoli medially, but these are poorly preserved.
Furthermore, failure to remove unnecessary lactational alveoli during weaning could result in inflammation and tissue damage.
In these ctenochasmatid genera, the crest is low and only weakly grooved, and in addition, none of these genera has dentaries bearing expanded alveoli.
Almost 200 alveoli are present beneath the anterior half of the orbit.
The evidence of coloring is most intense on the palate and internal surface of the alveolus, but it also often occurs on the external alveolus.
On general microscopic examination, the peripheral airways and the alveoli appeared normal in all cases.
The protuberances therefore represent the inflated margins of the alveoli dentalis.
