title: Sexually dimorphic ontogenetic trajectories of frontal sinus cross sections.
abstract: In this paper, we analyze a large published data set of cross sections of frontal sinuses of 3 to 11-year-olds (105 males and 87 females) from Central Europe to investigate several issues relating to frontal sinus ontogeny. Despite a large variation in every one year age cohort, we detect no asymmetry of the left average versus the right average frontal sinus lobe cross-sectional areas in the population, neither for males nor for females. The growth rate is shown to be nonuniform and differs between males and females. We demonstrate the use of a sigmoid function interpolation to characterize one aspect of ontogeny, namely, the functional relation between the cross-sectional area of the frontal sinus and the age of the individual. Ontogenetic trajectories of these cross-sectional areas are remarkably well modeled by a sigmoid function (logistic curve) with suitably estimated parameters for development up to an age of 11 years (females) and 9 years (males). However, these developmental curves also reliably predict the average adult cross-sectional area at age 19 (99% for females, 95% for males). Apart from possible inadequacies of the data set, we also discuss the possibility of heterochrony in the ontogenetic trajectory before versus after puberty.
authors.affiliation: Institute for Anthropology, University of Vienna, Austria. hermann.prossinger@univie.ac.at
authors.forename: H
authors.initials: H
authors.lastname: Prossinger
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D010256:Paranasal Sinuses / Q000033:anatomy & histology / Q000254:growth & development*; D011627:Puberty; D012727:Sex Characteristics