盲腸(cecum,caecum)古稱闌腸,是小腸和大腸交界處連接的盲囊,屬大腸的一部分,也是大腸的起始部,形如囊狀袋,在人體位於腹腔右下部的腹膜內;盲腸下端為盲端,至迴盲瓣處延續為升結腸,全長約6至8厘米。盲腸見於羊膜動物。
盲腸向上延續為升結腸,下部有一孔通闌尾,同迴腸交接區的內壁有迴盲瓣,有防止大腸內含物倒流的作用。
人體的盲腸退化,作用並不明顯,而植食性的動物則有一長袋狀盲腸,特別是那些不能反芻以消化纖維素食物的動物。
盲腸很少發炎,所謂盲腸炎多是闌尾炎的誤稱。
附圖
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Location of McBurney's point (#1)
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The superior mesenteric artery and its branches.
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Arteries of cecum and vermiform process.
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Inferior ileocecal fossa.
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Interior of the cecum and lower end of ascending colon, showing colic valve.
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Topography of thoracic and abdominal viscera.
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盲腸的直腸鏡影像,前面箭頭部份即為迴盲瓣
參考文獻
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