ɪɾ ɚɹˈaɪzᵻz klˈoʊs tə ðə pɹˈɪnsɛps pˈɑːlɪsˌɪs ˈɑːɹɾɚɹi, ænd dᵻsˈɛndz bᵻtwˌiːn ðə fˈɜːst dˈoːɹsəl ˌɪntɚɹˈɑːsiəs mˈʌsəl ænd ðə tɹænsvˈɜːs hˈɛd ʌvðɪ ɐdˈʌktɚ pˈɑːlɪsˌɪs, ænd ɹˈʌnz ɐlˈɔŋ ðə lˈæɾɚɹəl sˈaɪd ʌvðɪ ˈɪndɛks fˈɪŋɡɚ tʊ ɪts ɛkstɹˈɛmᵻɾi, wˌɛɹ ɪɾ ˈænɐstˌɑːmoʊsᵻz wɪððə pɹˈɑːpɚ dˈɪdʒɪɾəl ˈɑːɹɾɚɹi, səplˈaɪɪŋ ðə mˈiːdiːəl sˈaɪd ʌvðə fˈɪŋɡɚ.
It arises close to the princeps pollicis artery, and descends between the first dorsal interosseous muscle and the transverse head of the adductor pollicis, and runs along the lateral side of the index finger to its extremity, where it anastomoses with the proper digital artery, supplying the medial side of the finger.