title: Developmental study of the round window region.
abstract: A silicone impression method to study the anatomy of the round window region was used in 102 temporal bones belonging to individuals aged from 4 months of fetal life to 3-year-old children as well as adults. A total of 2,142 measurements of the round window, oval window and round window fossula was made in the molds. The data demonstrate that the round window shows a diameter from 1.21 mm (average for the short axis) to 1.74 mm (average for the long axis) and the circular shape was present in 55% of the adult temporal bones and in 18.18% of the fetal and infantile ones. The adult dimensions of the measured structures are reached during fetal development.
authors.affiliation: Department of Morphology, Federal University of São Paulo (UNIFESP), Brazil.
authors.forename: L V
authors.initials: LV
authors.lastname: Bonaldi
authors.forename: M A
authors.initials: MA
authors.lastname: De Angelis
authors.forename: R L
authors.initials: RL
authors.lastname: Smith
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology; D002508:Cephalometry; D002675:Child, Preschool; D005260:Female; D005333:Fetus / Q000196:embryology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009024:Morphogenesis; D012405:Round Window, Ear / Q000196:embryology* / Q000254:growth & development*; D012826:Silicone Elastomers; D013701:Temporal Bone / Q000196:embryology*
chemical_list: D012826:Silicone Elastomers