口腔 oral cavity，buccal cavity

互联网2013-11-14

799

指脊椎动物消化管最前端的腔。通过口裂（rimaoris）开口于外界。近口裂的部分在发生上由口陷形成。口腔的背壁是口盖，后方与咽头相连。口腔具有齿、舌、口腔腺等。在哺乳类中伴随唇和颊的形成，在齿列的前方出现口腔前庭。口腔具有摄取饮食物、齿的咀嚼、唾液的化学消化、咽下、味觉、发声和代替鼻呼吸等种种功能。

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