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Graphical and Analytic Representation of Sinusoids01:20

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Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
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The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
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Related Experiment Video

Updated: Jan 18, 2026

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
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Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model

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Under the surface: Correlates with maxillary sinus shape.

Ellen E I Fricano1, Joseph Nguyen1, Ryan Hallal1

  • 1Department of Medical Anatomical Sciences, Western University of Health Sciences, Pomona, California, USA.

Journal of Anatomy
|May 26, 2025
PubMed
Summary
This summary is machine-generated.

Maxillary sinus shape varies significantly with sex, tobacco, and drug use, with distinct areas of high variability identified. These findings offer new insights into sinus structure and drainage across different groups.

Keywords:
SPHARMdrug useparanasal sinuspneumatic spaceshapetobacco

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Area of Science:

  • Anatomy
  • Radiology
  • Anthropology

Background:

  • The maxillary sinus, crucial for facial structure, lacks robust shape analysis due to its complex morphology.
  • Previous studies focused on volume and 2D measurements, with limited understanding of finer structural variations like trabeculation and surface complexity.
  • Understanding maxillary sinus shape variations is vital for fields ranging from forensic anthropology to clinical practice.

Purpose of the Study:

  • To investigate correlations between maxillary sinus size and shape with age, sex, tobacco use, and drug use.
  • To apply novel quantitative methods for analyzing sinus shape variations.
  • To identify specific anatomical regions exhibiting the most significant shape differences across demographic and lifestyle groups.

Main Methods:

  • Segmentation of 109 adult individuals' left and right maxillary sinuses from CT scans.
  • Application of spherical harmonic analysis for quantitative shape analysis.
  • Statistical analyses including principal component analysis, t-tests, and Mann-Whitney U tests to assess group differences.

Main Results:

  • Significant differences in maxillary sinus shape were observed based on sex, tobacco use, and drug use.
  • The lateral-most apex and anterior wall (superior and inferior corners) showed the highest variability.
  • Males exhibited larger sinuses, but no significant differences in size or asymmetry were found across other tested groups. Age-related volume patterns were not supported.

Conclusions:

  • Maxillary sinus shape is influenced by sex, tobacco, and drug use, with specific areas of high variability identified.
  • This study provides a detailed quantitative analysis of sinus shape variations, contributing to a better understanding of sinus structure.
  • Findings have implications for future research on sinus structure, drainage, and their relationship with various influencing factors.