noun
Anatomical term for the part of the arm between the shoulder and the elbow.
上腕の筋肉を鍛えるトレーニングをしています。
I'm doing exercises to train my upper arm muscles.
Compound of 上 (じょう, 'upper') and 腕 (わん, 'arm'). The reading わん for 腕 is the on'yomi, commonly used in anatomical compounds.