Abstract
Purpose
To project the distance between the tip of the greater tubercle (GT), respectively, the proximal border of the tip of the coracoid process (CP) and the entry point of the coracobrachialis by the musculocutaneous nerve (MCN) proportionally onto the humeral length.
Methods
Sixty-six upper extremities were included in the study. The distance between the tip of the GT and the distal tip of the lateral humeral epicondyle (LE) was evaluated as the humeral length (HL). The interval between the tip of the GT and the entry point of the coracobrachialis muscle by the MCN was measured. The distance between the proximal border of the tip of the CP and the distal portion of the medial humeral epicondyle (ME) and the entry point of the MCN into the coracobrachialis were evaluated. Proportions were used to project the entry point of the coracobrachialis by the MCN along the HL, respectively, the interval between the proximal border of the tip of the CP and the distal tip of the ME.
Results
The entry point of the MCN into the coracobrachialis muscle can be expected at an interval between 14.9 and 33.9% of the HL (between the tip of the GT and the LE), starting from the tip of the GT. Regarding the reference line between the proximal border of the CP and the ME, the nerve’s entry point was located between 14.2 and 34.4%, starting from the CP.
Conclusion
Results represent easily applicable intervals for intraoperative localisation of the MCN.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by GH, AS and MM. The first draft of the manuscript was written by RK and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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All the investigated corpses were donated to the Division of Macroscopic and Clinical Anatomy of the Medical University of Graz under the approval of an ongoing body donation program and according to the Austrian curial law. While alive, the body donors consented to the postmortem donation of their tissues for research and teaching purposes.
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Krassnig, R., Hohenberger, G.M., Schwarz, A. et al. Proportional localisation of the entry point of the coracobrachialis muscle by the musculocutaneous nerve along the humerus. Eur J Trauma Emerg Surg 49, 299–306 (2023). https://doi.org/10.1007/s00068-022-02063-1
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DOI: https://doi.org/10.1007/s00068-022-02063-1