ɪt ɡˈɪvz ɐ bɹˈæntʃ tə ðə lˈækɹɪməl sˈæk bᵻfˌoːɹ bˈaɪfɚkˌeɪɾɪŋ ˌɪntʊ tˈuː bɹˈæntʃᵻz: wˈʌn bɹˈæntʃ ˈænɐstˌɑːmoʊsᵻz wɪððə tˈɜːmɪnəl ˈæŋɡjʊlɚ pˈɑːɹt ʌvðə fˈeɪʃəl ˈɑːɹɾɚɹi ænd ɪz ɪmpˈoːɹtənt fɚðə blˈʌd səplˈaɪ ʌvðə fˈeɪs; ðɪ ˈʌðɚ tɹˈævəlz ɐlˈɔŋ ðə dˈoːɹsəm ʌvðə nˈoʊz tə səplˈaɪ ðɪ ˈaʊɾɚ sˈɜːfɪs ʌvðə nˈoʊz, ænd fˈɔːɹmz ˈænɐstˌɑːmoʊsᵻz wɪð ɪts kˌɑːntɹəlˈæɾɚɹəl fˈɛloʊ, ænd wɪððə lˈæɾɚɹəl nˈeɪzəl bɹˈæntʃ ʌvðə fˈeɪʃəl ˈɑːɹɾɚɹi.
It gives a branch to the lacrimal sac before bifurcating into two branches: one branch anastomoses with the terminal (angular) part of the facial artery and is important for the blood supply of the face; the other travels along the dorsum of the nose to supply the outer surface of the nose, and forms anastomoses with its contralateral fellow, and with the lateral nasal branch of the facial artery.