terminal saccular period

ter·mi·nal sac stage of lung de·vel·op·ment

(tĕr'mi-năl sak stāj lŭng dĕ-vel'ŏp-mĕnt)
The period (26 weeks' gestation to birth) when many terminal sacs develop; their epithelium is very thin and capillaries bridge into the epithelial lining of the saccules, permitting adequate gas exchange for survival of the fetus if it is born prematurely.
Synonym(s): terminal saccular period.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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