其上部的尺骨(尺骨)變厚。在這個(近端)是incisura trochlearis(incisura trochlearis),用於與肱骨塊連接。塊狀切口有兩個過程:一個更大的後部過程 - 一個肘部過程(鷹嘴)和一個較小的前部過程 - 冠狀突(processus coronoideus)。在從橈骨(外側)的冠狀突的過程中,存在徑向切口(橈側切口),橈骨的頭部從該切口連接。冠狀突之下是尺骨(tuberositas ulnae)的粗隆。尺骨的下端(遠端)以尺骨頭部(尺橈骨頭)結束,從中可以看到莖突從其內側離開。頭部有一個關節圓周(圓周關節)用於與半徑關節。頭部的下表面是平坦的。
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