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Extensor digitorum brevis manus with "X" tendons.

Qing-hua Mao1, Jing Li

  • 1Department of Neonatal Intensive Care Unit, First People-s Hospital, Jining, Shandong, China; maoqinghua629@yahoo.com.

Romanian Journal of Morphology and Embryology = Revue Roumaine De Morphologie Et Embryologie
|September 3, 2014
PubMed
Summary
This summary is machine-generated.

This study observed bilateral extensor digitorum brevis manus muscles in a cadaver. Variations in its tendons and insertions were noted, offering insights into hand anatomy.

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Area of Science:

  • Anatomy
  • Morphology
  • Human Anatomy

Background:

  • The extensor digitorum brevis manus (EDBM) is an intrinsic hand muscle.
  • Variations in EDBM anatomy are infrequently reported.
  • Understanding EDBM variations is crucial for surgical and clinical contexts.

Purpose of the Study:

  • To document and describe the bilateral anatomical variations of the extensor digitorum brevis manus muscle.
  • To detail the specific origins, courses, and insertions of the observed EDBM muscles.

Main Methods:

  • Anatomical dissection of a 72-year-old Chinese male cadaver.
  • Observation and documentation of bilateral EDBM muscle morphology.
  • Detailed recording of tendon structure and insertion points.

Main Results:

  • Bilateral extensor digitorum brevis manus muscles were identified.
  • The left EDBM presented with double tendons (ulnar and radial) forming an 'X' shape.
  • The right EDBM originated from the dorsal radiocarpal ligament with a single insertion.

Conclusions:

  • This case highlights significant bilateral variations in EDBM muscle anatomy.
  • Such anatomical variations can impact the biomechanics of the index finger.
  • Documentation of these variations contributes to the anatomical knowledge base for clinical practice.