tricyclesinskirts: Henry Gray’s Anatomy of the Human Body: Posterior surface of the forearm, superficial muscles. Note how there aren’t any muscles in the fingers. Your fingers are controlled by tendons that connect to muscles in the forearm.
qnq: kyuenkyu: This site has some cool arm anatomy, especially about how it changes as it twists, which is often neglected in references. my early work had basically tubes as arms, or arms behind body, lol