論文

国際誌
2021年10月3日

Upper arm posture during human embryonic and fetal development.

Anatomical record (Hoboken, N.J. : 2007)
  • Yousuke Kumano
  • ,
  • Sayaka Tanaka
  • ,
  • Rino Sakamoto
  • ,
  • Toru Kanahashi
  • ,
  • Hirohiko Imai
  • ,
  • Akio Yoneyama
  • ,
  • Shigehito Yamada
  • ,
  • Tetsuya Takakuwa

305
7
開始ページ
1682
終了ページ
1691
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/ar.24796

The upper extremity posture is characteristic of each Carnegie stage (CS), particularly between CS18 and CS23. Morphogenesis of the shoulder joint complex largely contributes to posture, although the exact position of the shoulder joints has not been described. In the present study, the position of the upper arm was first quantitatively measured, and the contribution of the position of the shoulder girdle, including the scapula and glenohumeral joint, was then evaluated. Twenty-nine human fetal specimens from the Kyoto Collection were used in this study. The morphogenesis and three-dimensional position of the shoulder girdle and humerus were analyzed using phase-contrast X-ray computed tomography and magnetic resonance imaging. Both abduction and flexion of the upper arm displayed a local maximum at CS20. Abduction gradually decreased until the middle fetal period, which was a prominent feature. Flexion was <90° at the local maximum, which was discrepant between appearance and measurement value in our study. The scapular body exhibited a unique position, being oriented internally and in the upward direction, with the glenoid cavity oriented cranially and ventrally. However, this unique scapular position had little effect on the upper arm posture because the angle of the scapula on the thorax was canceled as the angle of the glenohumeral joint had changed to a mirror image of that angle. Our present study suggested that measuring the angle of the scapula on the thorax and that of the glenohumeral joint using sonography leads to improved staging of the human embryo. This article is protected by copyright. All rights reserved.

リンク情報
DOI
https://doi.org/10.1002/ar.24796
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/34605199
ID情報
  • DOI : 10.1002/ar.24796
  • PubMed ID : 34605199

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