A 34-year-old man complains of dry mouth and difficulty swallowing. He has no other complaints. Physical examination is begun in the head and neck region. The eye examination is grossly benign. The nasal sinus appears unremarkable. The patient’s oral cavity is then examined. To enable evaluation of the palatal elevation, the patient is asked to “say ah.” The muscles used to perform palatal elevation are derived from which of the following embryologic structures?
一名34岁男性主诉口干和吞咽困难。他没有其他主诉。体格检查从头颈部开始。眼部检查基本上是良性的。鼻窦似乎不明显。然后检查病人的口腔。为了评估腭部的抬高程度，患者被要求“说啊”。用于进行腭抬高的肌肉来源于下列哪个胚胎结构?
(A) Branchial arches 1 and 2
(B) Branchial arches 3 and 4
(C) Branchial arches 4 and 6
(D) Branchial clefts 1 and 2
(E) Branchial pouches 3 and 4
答案解析：
上腭膨出的肌肉来自鳃弓3(茎突咽肌)和鳃弓4(腭帆提肌)。它们分别由脑神经IX和X支配。
正确答案：B
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