Case report: Cystic lymphangioma of the vallecula.

The incidence of vallecular cysts is low. They deserve full awareness of their existence because clinically they may produce upper airway obstruction. The case of a 20 month old infant in whom the large vallecular cyst was incidentally found on a routine examination is presented with a review of the literature.

Distribution of microtubules and microfilaments in developing vestibular sensory epithelium of mouse otocysts grown in vitro.

Otocysts explanted from 12th-gestation-day mice and maintained in organ culture under went a series of developmental changes which paralleled those that occurred in vivo and which resulted in the formation of a sensory epithelium of the vestibular type. At the time of explantation presumptive vestibular sensory epithelium consisted of cells that were undifferentiated, pseudostratified and rapidly proliferating. The only microtubules present were those of the mitotic apparatus.