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Postnatal change in angle between the tympanic annulus and surrounding structures. Computer-aided three-dimensional

A Ikui1, I Sando, M Sudo

  • 1Elizabeth McCullough Knowles Otopathology Laboratory, Department of Otolaryngology, University of Pittsburgh School of Medicine, PA 15213, USA.

The Annals of Otology, Rhinology, and Laryngology
|January 1, 1997
PubMed
Summary

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Human ear development shows significant changes in the tympanic annulus orientation from infancy to adulthood. However, angles between the tympanic annulus, oval window, and internal auditory canal remain consistent, informing ear surgery.

Area of Science:

  • Anatomy
  • Developmental Biology
  • Otolaryngology

Background:

  • Understanding the three-dimensional spatial relationships of middle and inner ear structures is crucial for surgical interventions.
  • Postnatal development significantly alters craniofacial anatomy, potentially affecting the orientation of ear structures.

Purpose of the Study:

  • To investigate the developmental changes in the angles of the tympanic annulus, oval window, and internal auditory canal (IAC) in human ears.
  • To provide anatomical data relevant to pediatric ear surgery.

Main Methods:

  • Computer-aided three-dimensional reconstruction and measurement of 20 normal human temporal bones.
  • Analysis of angles relative to a standardized horizontal plane across a wide age range (1 day to 76 years).

Related Experiment Videos

Main Results:

  • The tympanic annulus plane shifts from a near-horizontal orientation in neonates (34.2°) to a more vertical orientation in adults (63.3°).
  • Angles between the tympanic annulus and oval window (11.9° ± 5.1°), and the tympanic annulus and IAC (68.6° ± 5.3°) remained constant throughout postnatal development.

Conclusions:

  • While the tympanic annulus orientation changes significantly with age, the relative spatial relationships between key ear structures are maintained.
  • These consistent anatomical relationships are important considerations for ear surgeons, particularly when operating on pediatric patients.