2026-06-01T07:24:38Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1142492025-01-15T01:05:51Zcom_20.500.14352_14col_20.500.14352_15

Fetal Development of Human Oral Epithelial Pearls with Special Reference to Their Stage-Dependent Changes in Distribution Kim, Ji Hyun Jin, Zhe Wu Shibata, Shunichi Yang, Jae Do Murakami, Gen Rodríguez Vázquez, José Francisco Cho, Baik Hwan 611 611.013 Dental lamina Human fetus Incisive suture Nasopalatine duct Oral epithelial pearls Postfusion rupture of the palate Anatomía 2410.06 Embriología Humana 2410.02 Anatomía Humana Objective To access detailed distribution and age-dependent changes of oral epithelial pearls. Design Investigation and analysis with human fetal serial sections. Setting Institute of Embryology. Methods This study examined serial frontal sections of the upper and lower jaws of 19 human fetuses at 12 to 18 weeks and of the lower jaws of four late-stage fetuses. Results The upper jaw contained more than 20 midline and more than 60 lateral pearls greater than 20 μm in diameter, whereas the lower jaw contained fewer than 30 pearls of the same size. Midline pearls in the upper jaw were often cylindrical or rugby-ball shaped, whereas all pearls in the lower jaw were small and spherical. Epithelial pearls in the upper jaw started developing along the upper midline until 12 weeks; lateral pearls and additional midline pearls (or strictly, paramedian pearls) developed until 15 weeks. In the lower jaw, however, pearl development started at 18 weeks and was almost always from the dental lamina. Some of the fetuses assessed had an open nasopalatine canal without a duct, but there was no fibrous connection between this canal and pearls. Similarly, the lip frenulum or incisive suture was not connected with these pearls. Conclusion The timing and sequence of development suggest that postfusion rupture of the palate by midline pearls was unlikely. Depto. de Anatomía y Embriología Fac. de Medicina TRUE pub 2025-01-14T12:18:27Z 2025-01-14T12:18:27Z 2017-05 journal article VoR https://hdl.handle.net/20.500.14352/114249 1055-6656 10.1597/15-291 1545-1569 eng Kim JH, Jin ZW, Shibata S, et al. Fetal Development of Human Oral Epithelial Pearls with Special Reference to Their Stage-Dependent Changes in Distribution. The Cleft Palate Craniofacial Journal. 2017;54(3):295-303. doi:10.1597/15-291 restricted access application/pdf SAGE Publications