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Related Concept Videos

Muscles of the Pelvic Floor and Perineum01:26

Muscles of the Pelvic Floor and Perineum

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The muscles of the pelvic floor and perineum are crucial for supporting the pelvic organs, controlling continence, and aiding in sexual function, childbirth, and core stability. They are typically divided into the superficial perineal layer and the deep pelvic floor layer.
Perineal Layer
The perineum is a diamond-shaped area below the pelvic diaphragm, divided into an anterior urogenital triangle that contains the external genitals and a posterior anal triangle housing the anus. The urogenital...
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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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The vertebral column or spine is a flexible column that supports the head, neck, and body and  allows for their movements. It also protects the spinal cord.
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The uterus, commonly called the womb, is a vital reproductive organ in females designed to provide a nurturing environment for the implantation and growth of an embryo. It is shaped like a hollow pear and positioned between the urinary bladder and the rectum. The uterus's structure allows it to support and protect a developing fetus throughout pregnancy.
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Related Experiment Video

Updated: Jan 6, 2026

Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse POP Quantification System
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Pelvic alignment changes during the perinatal period.

Saori Morino1, Mika Ishihara2, Fumiko Umezaki3

  • 1Department of Physical Therapy, Faculty of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka, Japan.

Plos One
|October 11, 2019
PubMed
Summary

Pregnancy causes significant widening of the anterior pelvic width, which persists one month postpartum. Pelvic tilt also changes during pregnancy and childbirth, impacting pelvic alignment.

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Area of Science:

  • Obstetrics and Gynecology
  • Biomechanics
  • Anatomy

Background:

  • The pelvic bones are crucial for load transfer and can be affected by pregnancy-induced alignment changes.
  • Pelvic bone misalignment during pregnancy may lead to pain and urinary incontinence.
  • Understanding perinatal pelvic alignment shifts is key for preventing and treating complications.

Purpose of the Study:

  • To investigate changes in pelvic alignment during pregnancy and one month postpartum.
  • To quantify alterations in pelvic width and tilt throughout the perinatal period.

Main Methods:

  • A prospective, longitudinal cohort study involving 201 women.
  • Pelvic measurements (anterior/posterior width, anterior tilt, asymmetry) taken at multiple gestational weeks and one month postpartum.
  • Statistical analysis using the Friedman test to assess changes over time.

Main Results:

  • Pelvic width significantly increased with pregnancy progression.
  • Anterior pelvic width remained wider at one month postpartum compared to early pregnancy.
  • Anterior pelvic tilt increased during pregnancy and decreased postpartum.

Conclusions:

  • Pelvic alignment undergoes continuous changes during the perinatal period.
  • Anterior pelvic width does not fully recover by one month postpartum.
  • Knowledge of these changes can help clinicians prevent pelvic misalignment complications.