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  • Title: One-third, two-thirds: relationship of the radial nerve to the lateral intermuscular septum in the arm.
    Author: Fleming P, Lenehan B, Sankar R, Folan-Curran J, Curtin W.
    Journal: Clin Anat; 2004 Jan; 17(1):26-9. PubMed ID: 14695584.
    Abstract:
    The radial nerve penetrates the lateral intermuscular septum of the arm before dividing into deep and superficial branches. It may be encountered in both anterior and posterior approaches to the humerus. An ability to accurately predict the point at which the nerve pierces the septum would be valuable during surgery in the arm, and would facilitate planning an approach to exploring the radial nerve after fractures of the distal humeral shaft. It would, in particular, make minimally invasive surgical techniques less dangerous. We dissected 20 cadaver upper limbs to establish whether the radial nerve enters the anterior compartment of the arm at a predictable level. We found that in almost every case the radial nerve entered the anterior compartment at a point within 5 mm of the junction of the distal and middle thirds of a line joining the lateral epicondyle of the humerus to the most lateral point of the acromion process of the scapula. This has not previously been described, and we believe is a useful aide-de-memoir to predicting the level at which the radial nerve penetrates the lateral intermuscular septum.
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