Anatomy of Brachial Plexus


=> Brachial Plexus consist Root, Trunk, Division, Cords & Branches

=> Brachial Plexus form by nerve root from C5 to T1

  • Root of Brachial Plexus
    • It Made by primary rami of spinal nerve C5, C6, C7, C8, T1

  • Trunk of Brachial Plexus
    • Upper Trunk Made by Root of C5 & C6 
    • Middle Trunk Form by C7 Root 
    • Lower Trunk Made by C8 & T1 Root

  • Cord of Brachial Plexus
    • Lateral cord form by ventral division of Uoper and middle Trunk

    • Medial cord form by ventral division of Lower Trunk

    • Posterior Cord form by Dorsal division of all three trunk

  • Branches of brachial plexus

    • 1. Branches of the roots

      • a. Nerve to serratus anterior (long thoracic nerve) (Cs, C6, C7).
      • b. Nerve to rhomboideus (dorsal scapular nerve) (Cs). 

    • 2. Branches of the trunks

      • These arise only from the upper trunk which gives two branches. 
      • a. Suprascapular nerve (C5, C6)
      • b. Nerve to subclavius (C5, C6) 

    • 3. Branches of the cords

      • a. Branches of lateral cord
      • i. Lateral pectoral (C5 -C7)
      • ii. Musculocutaneous (C5-C7) 
      • iii. Lateral root of median (C5-C7)

    • Branches of medial cord 

      • i. Medial pectoral (Cs, T1)
      • ii. Medial cutaneous nerve of arm (Cg’ T₁,) forearm (Cg’
      • iii. Medial cutaneous nerve of 
      • iv. Ulnar (C7, C8, T₁). C7
      • v. Medial root of median (Cg, T₁)

    • Branches of posterior cord

      • i. Upper subscapular (C5, C6) 
      • ii. Nerve to latissimus dorsi (thoracodorsal) (C6, C7, Cg)
      • iii. Lower subscapular (C5, C6)
      • iv. Axillary (circumflex) (C5, C6) 
      • v. Radial (C5-C, T1)

Diagram Of Brachial Plexus :-

Anatomy of Brachial Plexus
Brachial plexus

Brachial Plexus

Mnemonic for Brachial Plexus :-

=> Brachial plexus Mnemonic 

Mnemonic ” Risk To Dies Come Never “

  • Roots (ventral rami) C5 to T1
  • Trunks (upper, middle, lower)
  • Divisions (3 anterior and 3 posterior)
  • Cords (lateral, posterior, medial)
  • Nerve (Branches)

=> Brachial plexus Main branches 

Mnemonic “My Aunt Ragged My Uncle” :-

( From lateral to medial )

. Musculocutaneous

. Axillary

. Radial

. Median

. Ulnar

=> Branches of Medical Cord of Brachial Plexus Mnemonic

Mnemonic : M4U

  • Medial Pectoral nerve
  • Medial root of Median N.
  • Medial Cutaneous N. of Arm
  • Medial Cutaneous N. of Forearm
  • Ulnar Nerve

=> Branch of Posterior Cord of Brachial Plexus Mnemonic

Mnemonic : ULTRA 

  • Upper subscapular nerve 
  • Lower subscapular nerve
  • Thoracic nerve
  • Radial nerve
  • Axillary nerve

=> Branches of lateral cord of Brachial Plexus Mnemonic

Mnemonic : “LML” Love Me Lussy

  • Lateral pectoral nerve
  • Musculocutaneous nerve
  • Lateral root of median nerve
  • Branches of posterior cord

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