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The psoas quartus muscle.

R Shane Tubbs1, W Jerry Oakes, E George Salter

  • 1Department of Cell Biology, University of Alabama at Birmingham, Alabama, USA. rstubbs@uab.edu

Clinical Anatomy (New York, N.Y.)
|March 1, 2006
PubMed
Summary
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An anomalous muscle, a rare psoas quartus variant, was discovered during an anatomy dissection. This finding may explain unexplained femoral nerve compression in some patients.

Area of Science:

  • Anatomical studies
  • Human cadaveric research

Background:

  • Anatomy of the posterior abdominal wall is crucial for understanding neurovascular structures.
  • The psoas major and iliacus muscles are well-documented hip flexors.
  • Anomalous muscles in this region are rare but clinically significant.

Observation:

  • An unusual muscle was identified during routine dissection of an adult male cadaver.
  • The anomalous muscle originated from the transverse process of the left L3 vertebra and the medial quadratus lumborum.

Findings:

  • The observed muscle is believed to be a rare variant of the psoas quartus.
  • This muscle variant has been described only once previously in medical literature.
  • Potential for contributing to femoral nerve compression exists.

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Implications:

  • Clinicians should consider this rare anomaly in cases of unexplained femoral nerve compression.
  • Awareness of this anatomical variation is important for interpreting posterior abdominal wall imaging.
  • This finding contributes to the understanding of anatomical variations in the posterior abdominal wall.