This paper examines velar movements during the production of the nasal vowels /ɐ̰, ḭ, ṵ/ in Brazilian Portuguese (BP). Velum movements were measured for a female Brazilian speaker using fiberscopic video-recording synchronized with acoustic recording. The nasal vowel (Vn) was placed in initial, medial and final positions in nonwords with the following structure: VnCoVo, CoVnCoVo, and CoVoCoVn. The oral vowel Vo was /a, i, u/ and the oral consonant Co= /p/, /b/ or /f/. Our results based on fibroscopy confirm that (i) a nasal tail (/N/) is clearly observed in 85% of nasal vowel productions, (ii) the nasal tail is about the same length as the previous part of the vowel. This suggests that (iii) when Vn is in medial or final position, the maximum lowering of the velum is free to occur either before the nasal tail or during it.