The Brachial Plexus Anatomy USMLE: Roots, Trunks, Divisions, Cords, Branches, Clinical anatomy 

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The Brachial Plexus: Roots, Trunks, Divisions, Cords, Branches, Innervation, and Clinical anatomy
The brachial plexus is a network of nerve fibers that supply the skin and musculature of the upper limb. It begins in the root of the neck, passes through the axilla, and runs through the entire upper extremity.
The plexus is formed by the anterior rami (divisions) of cervical spinal nerves C5, C6, C7, and C8, and the first thoracic spinal nerve, T1.
In this article, we shall look at the anatomy of the brachial plexus - its formation and anatomical course through the body.
The brachial plexus is divided into five parts; roots, trunks, divisions, cords, and branches (a good mnemonic for this is Read That Damn Cadaver Book). There are no functional differences between these divisions - they are simply used to aid the explanation of the brachial plexus.
watch the complete video to understand the topic in detail
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