brachial plexus_UTSAV

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 %

5. 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

6. Dorsal scapular nerve
 Root value – C5
 Innervation – Rhomboideus major and minor
 Function - Retraction of scapula

7. Long thoracic nerve
 ‘Nerve of Bell’
 Root Value – C5, C6, C7
 Innervation – Serratus anterior
 Palsy – Winging of scapula
- Loss of overhead abduction

8. 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

9. 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

11. Lateral Cord
 Root Value – C5, C6, C7
 1.> Lateral pectoral
 2.> Lateral root of median
 3.> Musculocutaneous – biceps, brachialis,
coracobrachialis

12. 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)

13. Posterior cord
 Upper subscapular (C5,6)
 Lower subscapular (C5,6)
 Thoraco-dorsal (C6,7,8)
 Axillary ( C5,6)
 Radial (C5,6,7,8,T1)

26. THANK YOU