Age- and sex-related changes in the normal human ear

Chiarella Sforza, Gaia Grandi, Miriam Binelli, Davide G. Tommasi, Riccardo Rosati, Virgilio F. Ferrario

Research output: Contribution to journalArticlepeer-review

Abstract

The objective of this study was to supply information about: (1) normal sex-related dimensions of ears (linear distances and ratios, area); (2) left-right symmetry; and (3) growth changes between childhood and old age. The three-dimensional coordinates of several soft-tissue landmarks on the ears and face were obtained by a non-invasive, computerized electromagnetic digitizer in 497 male and 346 female healthy subjects aged 4-73 years. From the landmarks, paired ear width and length, the relevant ratios, ear areas and angles relative to the facial midline, as well as indices of left-right symmetry, were calculated, and averaged for age and sex. Comparisons were performed by factorial analysis of variance. All ear dimensions were significantly larger in men than in women (p <0.001). A significant effect of age was found (p <0.001), with larger values in older individuals. The ear width-to-length ratio and the sagittal angle of the auricle significantly decreased as a function of age (p <0.001) but without sex-related differences. On average, the three-dimensional position of ears was symmetric, with symmetry coefficients ranging between 92% and 96%. Asymmetry was found in the sagittal angle of the auricle (both sexes), in the ear width-to-length ratio and ear width (men only). Data collected in the present investigation could serve as a data base for the quantitative description of human ear morphology and position during normal growth, development and aging. Forensic applications (evaluations of traumas, craniofacial alterations, teratogenic-induced conditions, facial reconstruction, aging of living and dead persons, personal identification) may also benefit from age- and sex-based data banks.

Original languageEnglish
JournalForensic Science International
Volume187
Issue number1-3
DOIs
Publication statusPublished - May 30 2009

Keywords

  • Aging
  • Digital anthropometry
  • Ears
  • Forensic anthropology
  • Growth
  • Man

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Fingerprint Dive into the research topics of 'Age- and sex-related changes in the normal human ear'. Together they form a unique fingerprint.

Cite this