You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All are true about brachial plexus EXCEPT:- and explain in detail?
Contribution by C4 to brachial plexus is pre-fixed brachial plexus. Post-fixed brachial plexus has contribution by T2 Brachial plexus is formed by the anterior primary rami of C5, 6, 7, 8 & T1 It consists of roots, trunks, cords, divisions and branches. A total of 17 branches are given off from the plexus including 2 from roots, 2 from trunks and 13 from cords.