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Related Experiment Videos

Morphogenic mechanisms in the development of ethmoidal sinuses

V J Monteiro1, M P Dias

  • 1Department of Anatomy, S.D.M. College of Dental Sciences and Hospital, Sattur, Dharwad, India.

The Anatomical Record
|September 19, 1997
PubMed
Summary

Ethmoidal sinuses develop through two mechanisms: nasal cavity constriction by turbinal cushions and evagination via epithelial proliferation and disintegration. This challenges the sole evagination theory in sinus development.

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Area of Science:

  • Embryology
  • Anatomy
  • Developmental Biology

Background:

  • Current understanding posits paranasal sinuses develop solely as nasal cavity evaginations.
  • This view overlooks earlier embryological observations on sinus formation.

Purpose of the Study:

  • To investigate the developmental mechanisms of ethmoidal sinuses.
  • To clarify the roles of nasal cavity constriction and epithelial evagination in sinusogenesis.

Main Methods:

  • Analysis of serial coronal sections from 23 human fetuses (18-282 mm CR length).
  • Utilized various staining methods to visualize tissue development and interactions.

Main Results:

  • Ethmoidal sinuses originate from 'turbinal cushions' that fuse, constricting the nasal cavity.

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  • Epithelial proliferation and disintegration follow, forming the sinus lumen.
  • Interaction with cartilage leads to localized cartilage disintegration, observable with specific stains.

    • Conclusions:

    • Ethmoidal sinus development involves dual mechanisms: nasal cavity constriction and epithelial evagination.
    • The findings refine the understanding of sinusogenesis, highlighting a complex interplay of forces.