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Body Planes01:06

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Body planes in anatomy are imaginary flat surfaces used as reference points to divide the body into sections for anatomical study. These planes are essential for understanding the orientation, relationships, and spatial organization of anatomical structures.
The sagittal plane is the plane that divides the body or an organ vertically into right and left sides. If this vertical plane runs directly down the middle of the body resulting in equal division, it is called the midsagittal or median...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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ヒト胚の発達における螺旋体軸の方向性

Sena Fujii1, Shigehito Yamada1,2, Tetsuya Takakuwa1

  • 1School of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.

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PubMed
まとめ
この要約は機械生成です。

ヒトの胚の発達は,マウスとは異なり,体軸の有意な変化を示している. カーネギーステージ15で左螺旋状のパターンが現れ,脊柱の形成が先行する.

キーワード:
カーネギー・ステージMRI分析ボディの軸の向き胚の発達人間の胚左から右の方向

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科学分野:

  • 発達生物学
  • 人間の胚
  • 形質変異

背景:

  • ネズミの胚は 体の軸を右向きに回しています
  • ヒト胚の体軸の方向性は,ほとんど未定義のままである.
  • 人間の胚軸のパターンを確立することは 発達を理解するために極めて重要です

研究 の 目的:

  • ヒト胚の体軸の指向を特徴づけるために (カルネギー段階 13-17).
  • 螺旋体軸の確立のタイミングを調査する
  • 左と右の非対称性を調べるため

主な方法:

  • 京都コレクションのヒト胚 (CS13-CS17) の形態学的評価
  • ボディの軸の向きを右ヘリケータ (RH),左ヘリケータ (LH),中部 (M) に分類する.
  • 詳細な形態学的分析のための磁気共鳴画像 (MRI)

主要な成果:

  • カーネギーステージ (CS) 13では右螺旋 (RH) 方向が優勢であった.
  • CS15からCS17まで左螺旋 (LH) 方向が支配的になった.
  • 中間 (M) 型胚の有意な増加が観察され,CS17では70%に達した.
  • 螺旋体の軸の確立は,コンドロゲネシス (CS17-18) 前に起こります.
  • 内部臓器の横向性は,後の段階では,異なる身体軸方向に一貫していました.

結論:

  • ヒト胚の体軸の向きは,マウスの定義されたパターンと対照的に,実質的な変動性を示しています.
  • 螺旋体の軸は人間の発達初期 (CS13-CS15) に確立される.
  • 発見は人体軸の形成と 左-右非対称性の確立におけるその役割を洞察します