The ulna is one of the two bones in your forearm — the part between elbow and wrist. It sits on the little-finger side, opposite your thumb; its partner, the radius, is on the thumb side.

The ulna isUlna（尺骨）是 one of the two bones in your forearm前臂兩根骨頭的其中一根 the part between elbow and wrist前臂就是手肘和手腕之間那段 It sits on the little-finger side它在小指那一側 opposite your thumb跟大拇指相對 its partner, the radius它的搭檔radius（橈骨） is on the thumb side則在大拇指那一側

An easy way to feel it: rest your arm on a table, palm down, and run your finger along the edge nearest your little finger. That hard line is your ulna. The pointed bump at your elbow is its top end.

An easy way to feel it有個簡單的方法可以摸到它 rest your arm on a table把手臂平放在桌上 palm down手心朝下 and run your finger along the edge nearest your little finger用另一隻手的手指沿著靠近小指那一側的邊緣摸過去 That hard line is your ulna那條硬硬的線就是你的ulna The pointed bump at your elbow手肘那個尖尖的凸起 is its top end就是它的頂端

The plural is usually ulnae (from Latin), though ulnas is also used and is perfectly clear. The adjective is ulnar, which you will meet in 'ulnar nerve' — the nerve that runs past your elbow and gives you that electric shock when you knock your 'funny bone'.

The plural is usually ulnae複數通常是ulnae (from Latin)（來自拉丁文） though ulnas is also used不過ulnas也有人用 and is perfectly clear意思一樣清楚 The adjective is ulnar形容詞是ulnar which you will meet in 'ulnar nerve'你會在'ulnar nerve'（尺神經）裡遇到它 the nerve that runs past your elbow就是那條經過手肘的神經 and gives you that electric shock when you knock your 'funny bone'撞到「麻筋」時會讓你觸電般發麻

This is an anatomy word: doctors, nurses, physiotherapists, biology students. In ordinary talk people just say 'arm bone' or point.

This is an anatomy word這是解剖學的用字 doctors, nurses, physiotherapists, biology students醫生、護理師、物理治療師、生物系學生會用 In ordinary talk people just say 'arm bone'一般講話大家就說「手臂骨頭」 or point或是直接用手指一下

But it is a good word for students because it is one of those Latin bone names that stays the same in every language of medicine, so it is a word you can carry into other subjects.

But it is a good word for students但對學生來說這是個值得學的字 because it is one of those Latin bone names因為它是那種拉丁骨頭名稱之一 that stays the same in every language of medicine在各種醫學語言裡都通用 so it is a word you can carry into other subjects可以帶著它應用到其他科目上