neurologic disorders
Brachial Plexus and Lumbosacral Plexus Disorders
Symptoms and Signs of Plexus Disorders
Manifestations of plexus disorders include extremity pain and motor or sensory deficits that do not correspond to an isolated nerve root or peripheral nerve distribution. Foracute brachial neuritis,findings include severe supraclavicular pain, weakness, and diminished reflexes, with minor sensory abnormalities in the distribution of the brachial plexus. Usually, weakness develops and reflexes decrease as pain resolves. Severe weakness develops within 3 to 10 days, then typically regresses over the next few months. The most commonly affected muscles are the serratus anterior (causing winging of the scapula), other muscles innervated by the upper trunk, and muscles innervated by the anterior interosseous nerve in the forearm—patients may not be able to make anοwith the thumb and index finger. 