Anatomy of bachial plexus_UTSAV

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brachial plexus_UTSAV

brachial plexus_UTSAV

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  • 1. Dr. Utsav Agrawal
  • 2.  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. Pre-fixed P0st-fixed C5>15% T1<13% C5-6.8 to 12% T1 – 13.4 to22.4 %
  • 3. The Roots  Contributions from Ventral primary rami of C5, 6,7,8, and T1  May be pre-fixed or post-fixed  Braches from roots – Dorsal scapular nerve Long thoracic nerve
  • 4. Dorsal scapular nerve  Root value – C5  Innervation – Rhomboideus major and minor  Function - Retraction of scapula
  • 5. Long thoracic nerve  ‘Nerve of Bell’  Root Value – C5, C6, C7  Innervation – Serratus anterior  Palsy – Winging of scapula - Loss of overhead abduction
  • 6. The Trunks  Roots from C5 and C6 join to form upper trunk  C7 forms middle trunk  C8 and T1 forms lower trunk  Branches from trunks Suprascapular nerve (C5,C6) Nerve to subclavius (C5,C6) • Each trunk divides to form ventral and dorsal divisions which join to form cords
  • 7. Cords  Ventral divisions of upper and middle trunks  Lateral cord  Ventral division of lower trunk  Medial cord  Dorsal divisions of all three trunks Posterior cord
  • 8. Lateral Cord  Root Value – C5, C6, C7  1.> Lateral pectoral  2.> Lateral root of median  3.> Musculocutaneous – biceps, brachialis, coracobrachialis
  • 9. Medial Cord  Medial Pectoral (C8, T1)  Medial cutaneous nerve of arm (C8, T1)  Medial cutaneous nerve of forearm (C8,T1)  Medial root of median (C8,T1)  Ulnar (C7,8,T1)
  • 10. Posterior cord  Upper subscapular (C5,6)  Lower subscapular (C5,6)  Thoraco-dorsal (C6,7,8)  Axillary ( C5,6)  Radial (C5,6,7,8,T1)
  • 11. THANK YOU