21. The brachial plexus is formed by the T2. 22. The anterior distribution includes the cervical plexus ( C1-C4 ) and brachial plexus ( C5-T1 ). 23. Above and to its lateral side are the upper trunks of the brachial plexus and the Omohyoideus. 24. The long thoracic nerve traverses this passageway in addition to axillary blood vessels and the brachial plexus . 25. Brachial plexus anesthesia by percutaneous injection through axillary and supraclavicular approaches was developed in the early 20th century.26. It arises from the brachial plexus . 27. Complications associated with brachial plexus block include intra-arterial or intravenous injection, which can lead to local anesthetic toxicity. 28. Other rare but serious complications from brachial plexus block include pneumothorax and persistent paresis of the phrenic nerve. 29. The carotid tubercle is also used as a landmark for anaesthesia of the brachial plexus and cervical plexus. 30. Brachial plexus injuries are not uncommon.
