Pelvic inlet

Pelvic inlet is a significant anatomical structure in the pelvis. It is the superior opening of the true pelvis, leading into the pelvic cavity. The shape and dimensions of the pelvic inlet are of clinical importance in obstetrics, as they affect the passage of the fetus during childbirth.

Etymology

The term "pelvic inlet" is derived from the Latin pelvis, meaning "basin", and the English inlet, meaning "an entrance or opening".

Anatomy

The pelvic inlet is bounded by the pelvic brim, which is formed by the pubic symphysis anteriorly, the pubic crest, the pecten pubis, the arcuate line of ilium, the ala of sacrum, and the sacral promontory posteriorly.

The shape of the pelvic inlet varies between individuals and between sexes. In females, it is typically wider and more oval in shape to accommodate childbirth, while in males it is narrower and more heart-shaped.

Clinical significance

The dimensions of the pelvic inlet are of particular importance in obstetrics. During childbirth, the baby must pass through the pelvic inlet to enter the birth canal. The size and shape of the pelvic inlet can therefore affect the ease of childbirth and may influence the choice of delivery method.

In addition to its role in childbirth, the pelvic inlet can also be affected by certain medical conditions. For example, pelvic inlet contraction can occur as a result of pelvic inflammatory disease, endometriosis, or pelvic trauma. This can cause pain and difficulty during childbirth, and may require medical intervention.

Related terms

• Pelvic outlet: The inferior opening of the true pelvis.
• Pelvic cavity: The space enclosed by the true pelvis.
• Pelvic brim: The edge of the pelvic inlet.
• Pelvic floor: The base of the pelvic cavity, which supports the organs within it.

See also

• Pelvis
• Obstetrics
• Childbirth

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Pelvic_inlet

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  Animation of the pelvic inlet
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  Diagram of the pelvic inlet
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  Low-dose CT of transverse diameter of pelvic inlet
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  Low-dose CT of obstetric conjugate