EXTENSOR POLLICIS LONGUS
\ɛkstˈɛnsə pˈɒlɪsˌɪs lˈɒŋɡəs], \ɛkstˈɛnsə pˈɒlɪsˌɪs lˈɒŋɡəs], \ɛ_k_s_t_ˈɛ_n_s_ə p_ˈɒ_l_ɪ_s_ˌɪ_s l_ˈɒ_ŋ_ɡ_ə_s]\
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This muscle is long, flat, and fusiform; and is seated at the posterior part of the forearm. It arises from the posterior surface of the ulna and the interosseous ligament, and is inserted at the posterior part of the superior extremity of the first phalanx of the thumb. It extends the last phalanx of the thumb upon the first.
By Robley Dunglison
