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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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Spinal Nerves: Plexus II01:21

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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
The Lumbar Plexus
The lumbar plexus is situated within the lumbar region of the back and is primarily formed by the first four lumbar spinal nerves (L1 to L4). This plexus extends its branches into several nerves, including the...
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Anatomy of the Genitourinary System II: Bladder and Urethra01:19

Anatomy of the Genitourinary System II: Bladder and Urethra

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The lower urinary system consists of the urinary bladder and urethra, which are essential in storing and expelling urine from the body. Together with the internal and external sphincters, these structures work together to regulate urination effectively.Anatomy of the BladderThe urinary bladder is a muscular, stretchable organ behind the pubic bone and in front of the rectum. In females, the bladder is positioned anterior to the vagina and inferior to the uterus, while in males, it is located...
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Urinary Bladder01:23

Urinary Bladder

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The urinary bladder is a hollow, muscular sac that temporarily stores urine before it is expelled from the body. It can hold approximately 600 mL of urine prior to micturition. The bladder is retroperitoneal and located behind the pubic symphysis in the pelvic floor.
In males, the bladder is situated in front of the rectum, while in females, it is positioned anterior to the vagina and uterus. The bladder floor contains an inverted triangular area called the trigone, defined by the two ureteric...
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Abdominal Aorta01:25

Abdominal Aorta

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Once the aorta traverses the diaphragmatic plane at the aortic hiatus, it is known as the abdominal aorta. This anatomical structure is positioned leftward of the spinal column, encased within a cocoon of adipose tissue behind the peritoneal cavity. It terminates at the L4 vertebra, where it splits into the common iliac arteries. Prior to this bifurcation, the abdominal aorta gives rise to several vital branches.
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The Micturition Reflex01:26

The Micturition Reflex

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Urination, or micturition involves the coordination of the bladder's detrusor muscle and two sphincters to ensure controlled bladder emptying.
The process begins with bladder filling, where the bladder wall stretches as urine accumulates. This stretching activates the urine storage reflex, mediated by the sacral spinal segments and the pontine storage center. Efferent sympathetic impulses stimulate the detrusor muscle to relax and the internal urethral sphincter to contract, facilitating...
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Related Experiment Video

Updated: Jun 11, 2025

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
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The Integral Theory, Pelvic Floor Biomechanics, and Binary Innervation.

Jörgen Quaghebeur1,2, Peter Petros3, Jean-Jacques Wyndaele2

  • 1Department of Urology, University of Antwerp, Edegem, Belgium.

International Neurourology Journal
|October 4, 2024
PubMed
Summary

The Integral Theory Paradigm explains pelvic floor function through muscle forces, crucial for continence and organ function. Ligament integrity maintains this balance, preventing pelvic floor dysfunction.

Keywords:
AnatomyBiomechanicsContinenceDysfunctionPelvic floorSphincter

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Area of Science:

  • Pelvic floor biomechanics and dysfunction
  • Musculoskeletal system and organ pathophysiology

Background:

  • Pelvic floor muscles, fascia, and ligaments are vital for sphincter function and pelvic organ support.
  • Understanding pelvic floor dysfunction requires knowledge of biomechanics and pathophysiology.
  • The Integral Theory Paradigm offers a framework for analyzing pelvic floor function.

Purpose of the Study:

  • To explain the musculoskeletal basis of sphincter mechanisms and pelvic organ function using the Integral Theory Paradigm.
  • To elucidate the role of directional muscle forces in maintaining pelvic floor equilibrium.
  • To highlight the impact of ligament integrity on pelvic floor function and organ support.

Main Methods:

  • Utilizing the Integral Theory Paradigm to describe pelvic floor biomechanics.
  • Analyzing the interplay of three directional muscle vector forces (forward, backward, downward).
  • Examining the formation of anterior and posterior resultant forces and their equilibrium.

Main Results:

  • Pelvic floor function is determined by the equilibrium of anterior and posterior resultant forces generated by muscle vectors.
  • This resultant equilibrium is critical for maintaining urinary continence, facilitating voiding, and enabling defecation.
  • Disruption of this equilibrium, particularly due to loose ligaments, negatively impacts organ function, continence, evacuation, and sensory perception.

Conclusions:

  • The Integral Theory Paradigm provides a comprehensive model for understanding pelvic floor biomechanics and dysfunction.
  • Maintaining the equilibrium of muscle forces is essential for normal pelvic organ function.
  • Ligamentous integrity plays a critical role in supporting pelvic floor muscular function and preventing dysfunction.