27 May 2024
: Case report
A Prefixed Four-Trunk Brachial Plexus with Anomalous Anatomy of All Subsequent Divisions, Cords, and Terminal Branches: A Cadaveric Case Report
Unknown etiology, Educational Purpose (only if useful for a systematic review or synthesis)
Maya Mendonsa1ABDEF, Megan Busch1BDE, Hashir Faheem1BDE, Yusuf Nawras1BDE, Eric Lassiter1DE*, Adel Maklad123ABDEDOI: 10.12659/AJCR.943866
Am J Case Rep 2024; 25:e943866
Figure 3. Terminal branches of the anterior divisions and cords. (A) Low-magnification image of superficial structures of the brachial plexus which demonstrates most of the trunks and cords, especially cord arising from the anterior divisions. Blue lines indicate contributions to the anterior divisions and red lines indicate contributions to the posterior divisions. Blue stars indicate the medial antebrachial cutaneous nerve, red stars indicate the lateral pectoral nerve, and black stars indicate the medial pectoral nerve. (B) Image of the double M structure in the distal plexus. The inverted M (highlighted by green dotted line) is formed by the bifurcation of the middle cord, medial cord, and lateral cord. The upright M (highlighted in blue dotted line) is formed by the medial and lateral root of median nerve along with the ulnar and musculocutaneous nerves. Together, the 2 Ms form a diamond pattern.