The anterior interosseous nerve is a branch of the median nerve. It arises from the median nerve just distal to the antecubital fossa, about 5.5 cm distal to the medial epicondyle of the humerus. [2] It passes along the interosseous membrane between the ulna and radius. It terminates in the pronator quadratus muscle around the level of the wrist. It is largely a motor nerve. It supplies the fle...

OBJECTIVE We sought to determine lesion sites and spatial lesion patterns in spontaneous anterior interosseous nerve syndrome (AINS) with high-resolution magnetic resonance neurography (MRN). METHODS In 20 patients with AINS and 20 age- and sex-matched controls, MRN of median nerve fascicles was performed at 3T with large longitudinal anatomical coverage (upper arm/elbow/forearm): 135 contigu...

Anterior interosseous nerve palsy subsequent to proximal humerus fracture is rare compared with an axillary nerve injury. This article presents a case of anterior interosseous nerve palsy secondary to such a fracture in an 87-year-old woman after a simple fall onto her outstretched hand. The patient had no sensory involvement but was unable to form an O with her thumb and index finger. She had ...

Two cases of palsy of the anterior interosseous nerve were recently observed, each complicating a closed forearm fracture. A detailed description of this nerve lesion in association with a fracture has not, to my knowledge, been reported previously. The object of this paper is to record the findings and prognosis of the discrete nerve lesion observed in these two cases, and in addition to sugge...

Muscular variations of the extensor compartment of the forearm are generally encountered during surgical and dissection procedures. Additional bellies, extra tendons, and abnormal attachment are such reported variations. Knowledge of these kinds of variation are important for hand surgeons to plan the surgical procedure and modify their approach to that case, or the surgeon can take the advanta...