INLET OF THE PELVIS Meaning and
Definition
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The inlet of the pelvis, also known as the pelvic inlet or superior pelvic aperture, is a structural feature of the human pelvis. It defines the opening at the uppermost part of the pelvis, serving as the boundary between the abdominal cavity and the pelvic cavity.
Anatomically, the inlet of the pelvis is formed by the pelvic brim, or the superior margin of the bony ring of the pelvis. It extends from the sacral promontory, formed by the anterior projection of the first sacral vertebra, to the pubic symphysis, which is the joint connecting the two pubic bones at the front of the pelvis. The curved pelvic brim is composed of several bony structures including the sacral wings, the pectineal line, and the arcuate line.
The inlet of the pelvis is of great significance during childbirth. Its shape and dimensions play a crucial role in determining the ease or difficulty of labor and delivery. The size and orientation of the pelvic inlet can affect the passage of the baby's head through the birth canal. Clinicians and obstetricians often assess the shape and measurements of the inlet of the pelvis during prenatal care to anticipate potential complications during childbirth.
In summary, the inlet of the pelvis refers to the superior opening of the pelvis, which acts as a boundary between the abdominal and pelvic cavities. Its shape and size can impact the process of childbirth, making it an important consideration in obstetrics.
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A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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