4[2]Klueber K, Langdon HL. Anatomy of musculus levator veli palatini in the 15-week human fetus[J]. Acta Anat, 1979,105 : 94
5[3]Dickon DR. Anatomy of the normal velopharyngeal mechanism[J]. Clin Plast Surg, 1979, 2 :235
6[4]Moon JB, Smith AE, Folkins JW, et al. Coordination of velopharyngeal muscle activity during positioning of thr soft palate[J]. Cleft Palate J, 1994,31:45
7[5]Huang MHS, Lee ST, Rajendran K. Anatomic asis of cleft palate and velopharyngeal surgery : implication from a fresh cadaveric study[J]. Plast Reconstr Surg, 1998,101: 613