人的橈骨位於大拇指側,上端為扁圓形的頭,上面參與肘關節的組成,而以其周緣與尺骨構成橈尺近側關節(組成肘關節的一部分),下端粗大,下面參與橈腕關節的組成,其內側面與尺骨下端相接,構成橈尺遠側關節。
由於橈骨與尺骨上、下端之間均有關節,橈骨可以環繞尺骨做140°-160°的迴旋運動,即前臂和手的旋前和旋後運動;當橈骨下端旋至尺骨前方稱「旋前」,此時橈骨與尺骨交叉,與此相反的運動稱「旋後」,此時兩骨並列;這樣大大增加手的活動範圍。
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。
圖片
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橈骨的位置(顯示為紅色)。
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橈骨的形狀(左臂)
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上肢
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橈骨的骨莖突 - 前視圖
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Radius, ulnar notch - posterior view
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Radius, radial head - posterior view
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Radius, radial head - anterior view
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Radius l. dx. - ant. view
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Radius l. dx. - post. view
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Right human radius and ulna - post. view
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Human arm bones diagram
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Bones of left forearm - ant. view
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Bones of left forearm - post. view
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Left elbow-joint, showing anterior and ulnar collateral ligaments
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The Supinator
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Cross-section through middle of forearm
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Transverse section across distal ends of radius and ulna
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Radius
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Muscles of upper limb. Cross section.
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Wrist joint. Deep dissection. Posterior view.
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Wrist joint. Deep dissection.Anterior, palmar, view.
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Wrist joint. Deep dissection.Anterior, palmar, view.
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Wrist joint. Deep dissection.Anterior, palmar, view.
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