Brachial Plexus Overview

Brachial Plexus Overview

• Composed of roots from spinal nerves C5 to T1.
• Mnemonic for components: "Roots Reach To Drink Cold Beer" representing Roots, Trunks, Divisions, Cords, Branches.

Components of the Brachial Plexus

• Roots:
  • C5, C6, C7, C8, T1.
• Trunks:
  • Upper (C5-C6), Middle (C7), Lower (C8-T1).
• Divisions:
  • Each trunk splits into anterior and posterior divisions.

Visualization Techniques

• Draw three Y's, with the middle Y facing the opposite direction.
• Use two E's (Σ) for additional structure representations.
• Place an X between C5/6 and C7 for clarity in root connections.

Terminal Branches

• Musculocutaneous nerve: Most important branch.
• Axillary nerve: Key branch for shoulder regions.
• Median nerve: Vital for hand function.
• Radial nerve: Important for arm extension.
• Ulnar nerve: Significant for hand grip and dexterity.

Clinical Note

• Knowledge of terminal branches is critical as damage can lead to specific dysfunctions.
• Damage to the long thoracic nerve causes scapular winging, notably referenced by "C5,6,7 wings to heaven."