The spelling of the phrase "lower uterine segment" can be a bit tricky due to the presence of two similar sounds. The first sound is the "ow" diphthong, which is written in IPA as /aʊ/, and the second sound is the "er" sound, written as /ər/. When pronounced together, these sounds blend into a single syllable. The word "lower" is pronounced as /ˈloʊər/, and "uterine" as /ˈjutərɪn/. The final word "segment" is pronounced as /ˈsɛɡmənt/. Together, the phrase is pronounced as /ˈloʊər ˈjutərɪn ˈsɛɡmənt/.
The lower uterine segment refers to the specific anatomical region of the uterus that is situated between the upper part of the cervix and the main body of the uterus. Also known as the lower segment or the isthmus, it is the lowermost portion of the uterus, characterized by its thin and muscular walls.
During pregnancy, the lower uterine segment plays a crucial role in the process of childbirth. As the fetus grows and develops, the uterus expands and stretches to accommodate the growing baby. The lower uterine segment progressively thins out in preparation for childbirth and allows for the cervical opening to dilate. This process is known as effacement, where the lower uterine segment becomes softer and more elastic.
During the actual process of labor and delivery, the lower uterine segment actively contracts and relaxes to facilitate the baby's descent through the birth canal. Its muscular walls exert forces to propel the fetus downwards, aiding in the expulsion of the baby. The lower uterine segment acts as a junction between the contracting upper part of the uterus and the cervix, coordinating the intricate process of labor.
In medical procedures such as cesarean sections, the lower uterine segment is an important consideration. Surgeons make an incision in this region to access the fetus for delivery. The lower uterine segment's thin and highly contractile nature makes it an ideal site for surgical entry, reducing maternal complications and promoting safe delivery.
The inferior portion of the uterus which must be dilated in order to allow of the expulsion of the fetus in parturition.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.