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The uterus is a thick-walled, pear-shaped organ measuring seven centimetres (about 2.75 inches) in length and weighing 30 grams (about one ounce) in an unpregnant woman in her later teens. It has a buttonlike lower end, the cervix, that merges with the bulbous larger portion, called the corpus. The corpus comprises approximately three-fourths of the uterus. There is a flat, triangular-shaped cavity within the uterus. At term, the uterus is a large, thin-walled, hollow, elastic, fluid-filled cylinder measuring approximately 30 centimetres (about 12 inches) in length, weighing approximately 1,200 grams (2.6 pounds), and having a capacity of 4,000 to 5,000 ...(100 of 19882 words)