France and the United Kingdom agreed to support Poland and in August of 1939, German troops began to gather on the Polish border. By September 1st, Germany launched an invasion of Poland.
The brachial plexus is a network of nerves that originate in the neck region and branch off to form most of the other nerves that control movement and sensation in the upper limbs, including the shoulder, arm, forearm, and hand.
Nerve Plexuses. A nerve plexus is a network of nerves that seem to be tangled that mostly serve the limbs. Each network is a network of nerves that come together and then redistribute themselves out with a different distribution of nerves into the limbs.