244.Location of large bowel （大肠正常部位）

The large bowel usually occupies the periphery of the abdomen. The small bowel is located more centrally. Here, the large bowel (solid black arrows) contains a normal amount of air. The liver occupies the right upper quadrant and normally displaces all bowel from this area.

【大肠正常部位】 大肠通常位于腹部周围，小肠则更偏中间。大肠内正常含有大量气体。肝脏位于右上腹，通常推移周围肠道。

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Recognizing large bowel 

o Large bowel is peripherally placed around the perimeter of the abdominal cavity except for the right upper quadrant, which is occupied by the liver (Fig. 13-7). 

o Haustral markings usually do not extend completely across the large bowel from one wall to the other. If they do connect one wall with another, haustral markings are spaced more widely apart than the valvulae conniventes of the small bowel. 

Recognizing small bowel 

o Small bowel is centrally placed in the abdomen. Valvulae markings typically extend across the lumen of small bowel from one wall to the other. The valvulae are spaced much closer together than the haustra of the large bowel (Fig. 13-9). 

o Small bowel can achieve a maximum diameter, even when dilated, of about 5 cm. Large bowel can dilate to many times that size. 

来源：每天朗读一段医学影像学英语文章

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