Neuroanatomy of the brachial plexus: Normal and variant anatomy of its formation

Abstract

The brachial plexus is the complex network of nerves, extending from the neck to the axilla, which supplies motor, sensory, and sympathetic Wbers to the upper extremity. Typically, it is formed by the union of the ventral primary rami of the spinal nerves, C5-C8 & T1, the so-called "roots" of the brachial plexus. By examining the neural architecture of the brachial plexus, the most constant arrangement of nerve Wbers can be delineated, and the most predominate variations in the neural architecture deWned. A thorough understanding of the neuroanatomy of the brachial plexus, with an appreciation of the possible anatomic variations that may occur is necessary for eVective clinical practice.