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Brachical plexus in Simple and Easier way:- So Plexus simply means "Collection of Nerve Fibres" So By name :-Brachial Plexus means -"Collection of Nerve fibres of Brachium (Arm)." Plexuses Inside Human Body :- When the Anatomists were exploring the human body they found out several bundles of nerve fibres which are connected both physically and functionally and they called these bundles later as "Plexus" Depending on their location they are of different types like :- Brachial Plexus and Sacral plexus etc. Origin of Brachial Plexus :- Now the Brachial  plexus is actually formed by major contribution from - C5,C6,C7,C8and T1 Spinal Nerves ,sometimes the C4 and T2 Nerves do get involved in this plexus formation If the contribution from C4 is very high in Brachial plexus formation than it is known as :- Pre-Fixed brachial plexus. If  the contribution from T2 is very high in Brachial plexus formation than it is known as...