Summary Brachial Plexus Night Before EXAM REVISION

Brachial Plexus Night Before
Quick Map:

Roots: C5–T1

Trunks: Superior (C5–C6), Middle (C7), Inferior (C8–T1)

Cords: Lateral, Medial, Posterior

Branches: Musculocutaneous, Median, Ulnar, Axillary, Radial

Key Lesions:

Erb’s palsy: C5–C6 → Waiter’s tip, shoulder dystocia

Klumpke’s palsy: C8–T1 → Claw hand, upward traction

Radial nerve: Wrist drop

Median nerve: Ape hand

Ulnar nerve: Claw hand

Nerve Roots Muscles Clinical

Musculocutaneous C5–C7 Biceps, Brachialis Flex elbow

Deltoid, Teres
Axillary C5–C6 Abduct shoulder
minor

Extend wrist → Wrist drop if
Radial C5–C8 Triceps, extensors
lesion

Forearm flexors, Thumb opposition → Ape
Median C5–T1
thenar hand

Finger abduction/adduction →
Ulnar C8–T1 FCU, interossei
Claw hand

Mnemonic: Randy Travis Drinks Cold Beer (Roots → Trunks → Divisions → Cords
→ Branches)




Brachial Plexus Night Before 1