桡骨

橈骨
上肢
橈骨為 #1
标识字符
拉丁文Radius
MeSHD011884
TA98A02.4.05.001
TA21210
FMAFMA:23463
格雷氏p.219
《骨骼解剖学术语（英语：Anatomical terms of bone）》

桡（ráo）骨（英語：radius，radial bone）是人和脊椎动物（四足）前臂两长骨中，外侧的一块骨骼；在某些动物（如蛙和蟾蜍），桡骨与尺骨愈合成桡尺骨。

人的桡骨位于大拇指側，上端为扁圓形的头，上面参与肘关节的组成，而以其周缘与尺骨构成桡尺近侧关节（组成肘关节的一部分），下端粗大，下面参与桡腕关节的组成，其内侧面与尺骨下端相接，构成桡尺远侧关节。

由于桡骨与尺骨上、下端之间均有关节，桡骨可以环绕尺骨做140°－160°的回旋运动，即前臂和手的旋前和旋后运动；当桡骨下端旋至尺骨前方称“旋前”，此时桡骨与尺骨交叉，与此相反的运动称“旋后”，此时两骨并列；这样大大增加手的活动范围。

如果跌倒時用手掌撐地，由於橈骨須承受所有力量，有可能因此發生骨折。

图片

  • 桡骨的位置（显示为红色）。
    桡骨的位置（显示为红色）。
  • 桡骨的形状（左臂）
    桡骨的形状（左臂）
  • 上肢
    上肢
  • 桡骨的骨茎突 - 前视图
    桡骨的骨茎突 - 前视图
  • Radius, ulnar notch - posterior view
    Radius, ulnar notch - posterior view
  • Radius, radial head - posterior view
    Radius, radial head - posterior view
  • Radius, radial head - anterior view
    Radius, radial head - anterior view
  • Radius l. dx. - ant. view
    Radius l. dx. - ant. view
  • Radius l. dx. - post. view
    Radius l. dx. - post. view
  • Right human radius and ulna - post. view
    Right human radius and ulna - post. view
  • Human arm bones diagram
    Human arm bones diagram
  • Bones of left forearm - ant. view
    Bones of left forearm - ant. view
  • Bones of left forearm - post. view
    Bones of left forearm - post. view
  • Left elbow-joint, showing anterior and ulnar collateral ligaments
    Left elbow-joint, showing anterior and ulnar collateral ligaments
  • The Supinator
    The Supinator
  • Cross-section through middle of forearm
    Cross-section through middle of forearm
  • Transverse section across distal ends of radius and ulna
    Transverse section across distal ends of radius and ulna
  • Radius
    Radius
  • Muscles of upper limb. Cross section.
    Muscles of upper limb. Cross section.
  • Wrist joint. Deep dissection. Posterior view.
    Wrist joint. Deep dissection. Posterior view.
  • Wrist joint. Deep dissection.Anterior, palmar, view.
    Wrist joint. Deep dissection.Anterior, palmar, view.
  • Wrist joint. Deep dissection.Anterior, palmar, view.
    Wrist joint. Deep dissection.Anterior, palmar, view.
  • Wrist joint. Deep dissection.Anterior, palmar, view.
    Wrist joint. Deep dissection.Anterior, palmar, view.

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