Anatomy of bachial plexus_UTSAV

brachial plexus_UTSAV

1. BRACHIAL PLEXUS : ANATOMY 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. Branches from cord

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

10. 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)

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

12. Sensory

13. Relations

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