Burak BİLECENOĞLU, Sibel KİBAR, Aysun UZ, Luis FILGUEIR

Morphometry of the anterior interosseous nerve: a cadaveric study

Objectives: Pathophysiology and etiology of anterior interosseous nerve (AIN) syndrome are still controversial. This anatom-ical dissection study aimed to understand the anatomy of AIN.Methods: From a random sample of upper extremities of whole-body human cadavers (n=10), 20 upper extremities were includ-ed in the study. Two of the cadavers were females and 8 were males (age range 34–62 years). Specimens were dissected withthe elbow in extension, wrist in neutral position and forearm in pronation. After superficial dissection, the pronator teres mus-cle was released, and the branching pattern of the AIN and the separation of the nerve from the interepicondylar line wererecorded. The branches to the pronator teres, flexor pollicis longus, flexor digitorum profundus and flexor digitorum superficialiswere recorded according to their distance from the interepicondylar line.Results: The AIN branched from the main trunk 5.1 to 47.89 mm (mean 37.58±11.25 mm) distal to the interepicondylar line.AIN gave off 1–4 branches to the pronator teres. The first branch left the AIN 10.05–83.84 mm proximal and entered the mus-cle 23.49–43.72 mm distal to the interepicondylar line. AIN gave 1–4 branches to the flexor pollicis longus, flexor digitorum pro-fundus and flexor digitorum superficialis at varying distances. The origin of the branches of AIN, as well as the innervation byone or multiple branches for a muscle, was variable.Conclusion: This study provides a detailed map of the anterior interosseous nerve innervating flexor pollicis longus, flexordigitorum profundus and flexor digitorum superficialis muscles, to serve as a guide for location of AIN block in patients withupper extremity spasticity and AIN syndrome.

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ISSN: 1307-8798
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 2007
Yayıncı: Deomed Publishing

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