Translation of "Forearm" in Japanese

The length of your forearm.

‎人の腕の長さほどある

The elbow is a joint that connects the forearm and the upper arm.

肘は上腕と前腕をつなぐ関節だ。

My wrist and forearm hurt, I think I might be suffering from carpal tunnel syndrome.

前腕と手くびが痛いです。手根管症候群が原因かもしれない。