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The double-headed accessory iliacus muscle: a case report.

Marta Pośnik1, Nicol Zielinska2, Piotr Łabętowicz3

  • 1Department of Anatomical Dissection and Donation, Medical University of Lodz, Lodz, Poland.

Folia Morphologica
|April 3, 2024
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Summary

A rare double-headed accessory iliacus muscle was discovered during cadaver dissection. This anatomical variation may compress the femoral nerve, highlighting the importance of recognizing such variations for accurate diagnosis and treatment.

Keywords:
accessory iliacusanatomical variationsfemoral nerve compression

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Area of Science:

  • Anatomy
  • Morphology
  • Clinical Significance

Background:

  • Accessory muscles are common in the human body and often clinically significant.
  • An anomalous accessory iliacus with two heads was identified.
  • Its location suggests a high probability of causing femoral nerve compression.

Purpose of the Study:

  • To report a rare case of a double-headed accessory iliacus muscle.
  • To highlight its potential clinical significance regarding femoral nerve compression.

Main Methods:

  • Routine dissection of the posterior abdominal wall.
  • Observation, measurement, and photography of the anomalous muscle.
  • Identification of the femoral nerve's course relative to the muscle.

Main Results:

  • A double-headed accessory iliacus muscle (superficial and deep heads) was identified.
  • The inferior roots of the femoral nerve exhibited an unusual course between the muscle heads.
  • Normal anatomy of other posterior abdominal wall structures was also observed.

Conclusions:

  • Awareness of morphological variations like the double-headed accessory iliacus is crucial.
  • This variation's association with neurovascular structures and hip joints warrants attention.
  • Recognizing this atypical morphology aids in proper diagnosis and treatment of potential femoral nerve issues.