Along the anterior of the forearm, the median and ulnar nerves supply nerve signals to the skin and to the flexor muscles of the hand and fingers.Īs major sensory components of the body, the hands are the destination for a majority of the nerves in the upper limb. Skin in the posterior forearm and extensor muscles of the hand and fingers are supplied by the branches of the radial nerve. These nerves control the forearm muscles that move the hands and fingers through tendons that pass through the wrist. Several major nerves continue from the arm into the forearm, including the radial, median, and ulnar nerves. The musculocutaneous nerve innervates the flexor muscles of the arm, including the biceps brachii and brachialis muscles. Also running along the posterior of the arm, the radial nerve provides nerve signals to the triceps brachii muscle that extends the forearm and the skin of the posterior arm. Running through the superior and posterior portions of the shoulder, the axillary nerve stimulates the deltoid muscle and receives information from sensory receptors in this region. The upper arm is served by several major nerves, including the axillary, radial, and musculocutaneous nerves. Some of these impulses are sent from various parts of the brain and spinal cord some come from sense organs located in the joints, ligaments, and tendons and some come from nervous tissue in the muscles themselves. Each of these nerves carries information in the form of nerve impulses to and from a particular region of the arm and hand. Five major nerves extend from the brachial plexus into the arm: the axillary, musculocutaneous, median, radial, and ulnar nerves. These nerves merge to form a network called the brachial plexus before continuing into the arm. Starting in the trunk of the body, the nerves of the arm and hand arise from the cervical and thoracic regions of the spinal cord as spinal nerves. Rapid conduction of sensory nerve signals from the hands provides critical information to the brain and feedback during precise activities. Even the tiny hand muscles, which perform very delicate and precise movements, are driven by about 200,000 neurons. The movements of the arms must be fast, precise, and strong to complete the diverse activities the body engages in throughout the day. The nerves of the arm and hand perform a substantial two-fold role: commanding the intricate movements of the arms all the way down to the dexterous fingers, while also receiving the vast sensory information supplied by the sensory nerves of the hands and fingers.
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