38. 吞嚥時,耳咽管於咽隆凸處會張開,以調整中耳內壓力的平衡,而張開此管口之肌肉為:(A)腭咽肌(palatopharyngeal muscle) (B)懸壅垂肌(uvular muscle) (C)提腭肌(levator palati muscle) (D)張腭帆肌(tensor veli palatini muscle)