The radial nerve originates from which plexus?

The radial nerve emerges from the brachial plexus. This plexus is crucial because it innervates the upper limb, meaning it supplies the nerves to the muscles and skin of the shoulder, arm, and hand. The radial nerve specifically arises from the posterior cord of the brachial plexus and is responsible for motor functions in the posterior compartment of the arm and forearm, as well as sensory functions to parts of the arm and hand.

Understanding the brachial plexus is essential for grasping the anatomy of the upper extremity. It consists of the roots from the lower cervical and upper thoracic spine segments (C5-T1) and forms major nerves, including the radial nerve. Knowledge of this connection helps practitioners and students relate symptoms of nerve injuries or conditions affecting upper limb functionality to specific neural pathways.