Variations of the branches arising from the third part of the axillary artery: a cadaveric study

Abstract

Objectives: This study aims to describe variations of the third part of the axillary artery branches with respect to their diameter, origin, subsequent branches, and gender. Methods: One-hundred and forty cadaveric shoulders were examined bilaterally in the Centre for Anatomy and Human Identification, University of Dundee, which is regulated by Human Tissue Act (Scotland) 2006. Branches arising from the third part of the axillary artery were dissected and the diameter, origin, subsequent branching patterns of each branch were documented, as well as gender. T-tests and chi-square tests were used to determine the association between the variables. Results: The most common variations were associated with the posterior circumflex humeral artery (48.3%), followed by the anterior circumflex humeral (25%) and subscapular arteries (16.7%). Variations of the anterior circumflex humeral artery were more common in females than males (p<0.05). A significant association between the origin of posterior circumflex humeral artery and its subsequent branching pattern was observed. In females, the anterior circumflex humeral artery was more likely to give rise to the profunda brachii when it originated from the posterior circumflex humeral artery. Conclusion: Branches of the third part of the axillary artery vary in diameter, origin and subsequent branching patterns and the gender. An understanding of these variations is essential for accurate radiological diagnostic interpretation and therapeutic intervention. The difference in the variations observed and those reported in the literature suggest the need for further large scale studies.

Keywords

• axilla
• axillary artery
• shoulder
• variations

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