terminal sacs

terminal saccules

the thin-walled dilations (primordial alveoli) that develop at the ends of the respiratory bronchioles and develop a close relationship with the capillaries.
Synonym(s): terminal sacs

terminal sacs

thin-walled dilations that develop at the ends of the respiratory bronchioles during fetal development; they develop a close relationship with the capillaries, and their appearance marks the point at which limited respiration becomes possible. Also called primitive or primordial alveoli and terminal saccules.
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