The antrums and ethnoids are the most fully developed of the nasal accessory sinuses of the full term fetus. At the time of birth, these sinuses are of appreciable size and fairly well surrounded by bony or cartilaginous structures. Later they contain air, and one usually thinks of them as cavities filled with air. However, in the unruptured amniotic sac these sinuses cannot contain air, and they only become aerated some time after birth. What then are the contents of the sinuses while in the unruptured amniotic sac, or during the period of birth before aeration has taken place? The time necessary for this clearing process to take place together with the physiologic phenomena involved constitutes a problem of rather unusual interest. The influence which variations of the physiologic phenomena may have on the subsequent health of the infant makes this study of considerable importance. The same problems
WASSON WW. CHANGES IN THE NASAL ACCESSORY SINUSES AFTER BIRTH. Arch Otolaryngol. 1933;17(2):197–211. doi:10.1001/archotol.1933.03570050184005
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