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Coracobrachialis muscle: morphology, morphometry and gender differences.

Isurani Ilayperuma1, B G Nanayakkara2, R Hasan3

  • 1Department of Anatomy, Faculty of Medicine, University of Ruhuna, P.O. Box 70, Galle, Sri Lanka. iisurani@yahoo.com.

Surgical and Radiologic Anatomy : SRA
|October 15, 2015
PubMed
Summary

This study details the coracobrachialis muscle (CBM) and musculocutaneous nerve (MCN) anatomy in Sri Lankans. Arm length can predict the MCN

Keywords:
CoracobrachialisGender differencesMorphometryMusculocutaneous nerve

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Area of Science:

  • Anatomy
  • Morphology
  • Human Anatomy

Background:

  • The coracobrachialis (CBM) muscle exhibits significant variability in morphology and innervation.
  • Understanding the precise anatomical relationships of the CBM and musculocutaneous nerve (MCN) is crucial for surgical procedures.

Purpose of the Study:

  • To investigate the morphology, morphometry, and gender-specific variations of the coracobrachialis muscle.
  • To determine the exact anatomical position of the musculocutaneous nerve relative to the coracobrachialis muscle and surrounding landmarks in a Sri Lankan population.

Main Methods:

  • Examination of 312 cadaveric upper limbs to document CBM attachments, dimensions, and MCN relationship.
  • Morphometric analysis and statistical evaluation of collected data.

Main Results:

  • The coracobrachialis muscle demonstrated variations in origin from the coracoid process and biceps brachii tendon.
  • Significant gender differences were observed in all morphometric parameters of the CBM.
  • The musculocutaneous nerve perforated the coracobrachialis muscle in 83.33% of cases, typically within the middle third.
  • A positive correlation between arm length and the distance from the coracoid process to the MCN entry point (distance P) was established.

Conclusions:

  • The study provides novel insights into the origin of the coracobrachialis muscle.
  • Arm length can be utilized to predict the distance P, with a ratio of arm length divided by 5.
  • Accurate anatomical knowledge of the MCN's position relative to the CBM is vital for surgical interventions.