BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY
Uterus. Coloured ultrasound scan of the uterus and cervix (lower centre) of a woman during the fifth month of pregnancy (foetus not seen). Ultrasound scanning is a diagnostic technique that sends high-frequency sound waves into the body via a transducer. The returning echoes are recorded and used to build an image of an internal structure. Routine ultrasound scans during pregnancy examine and measure the length and degree of dilation of the cervix, the opening of the uterus. If the cervix is shorter and softer than normal, there may be increased risk of miscarriage during the second trimester of pregnancy.
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