Coexistence of variant pronator teres muscle and variant course of the neurovascular structures in the arm: clinical significance

Suresh Narayanan, Priyadharshini Nattalam Adikesavan
Surgical and Radiologic Anatomy: SRA 2020 January 6
In literature, the presence of the supracondylar process, fibrous band enclosing the neurovascular structures, and the additional head of pronator teres have been reported as isolated reports. In this article, we describe three unique variations observed in the left upper limb of a 63-year-old female cadaver, (1) the variant origin of pronator teres from the supracondylar process, (2) the variant course of the median nerve and brachial artery passing through a fibrous tunnel in the lower third of the arm, later behind the supracondylar process and the variant pronator teres, and (3) the higher origin of radial artery from the brachial artery in the arm. The knowledge of such rare variants could be resourceful for surgeons in localizing the median nerve entrapment, interpreting arteriograms of the upper limb and avoiding accidental damage to the radial artery.

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