Brachial plexus image and its pnemonics to remember

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Here is a comprehensive overview of the Brachial Plexus — anatomy, diagrams, and mnemonics.

Brachial Plexus — Anatomy

The brachial plexus is formed by the anterior rami of C5–C8 and T1. It originates in the neck (between anterior and middle scalene muscles), passes over rib I, and enters the axilla. All major nerves innervating the upper limb arise from it.

Diagrams

Anatomical Overview (Gray's Anatomy for Students)

Brachial Plexus — Major components in neck and axilla

Schematic: Roots → Trunks → Divisions → Cords → Terminal Nerves

Cadaveric + Labeled Schematic (with Terminal Branches)

Brachial Plexus cadaveric and schematic diagram

Structure: The 5 Parts (R-T-D-C-B)

Part	Components	Detail
Roots	C5, C6, C7, C8, T1	Anterior rami; between scalene muscles
Trunks	Superior, Middle, Inferior	C5+C6 = Superior; C7 alone = Middle; C8+T1 = Inferior
Divisions	Anterior + Posterior (×3 trunks = 6 total)	Each trunk splits; no named nerves arise here
Cords	Lateral, Posterior, Medial	Named by relation to axillary artery (2nd part)
Branches	Terminal nerves	Musculocutaneous, Axillary, Radial, Median, Ulnar

Mnemonics

1. The Parts: "Randy Travis Drinks Cold Beer"

Roots → Trunks → Divisions → Cords → Branches

2. Roots (levels): "C5-T1" — "Cervical 5 To Thoracic 1"

3. Trunks: "3 Trunks — SIM"

Superior (C5+C6)
Inferior (C8+T1)
Middle (C7 alone)

Or remember: "C5+6 = Superior, C7 = Middle, C8+T1 = Inferior"

4. Cord Formation:

Lateral cord = Anterior divisions of Superior + Middle trunks
Medial cord = Anterior division of Inferior trunk
Posterior cord = ALL THREE posterior divisions

Mnemonic for cords: "Lateral is Love, Medial is Medial, Posterior gets all the Posterior"

5. Terminal Branches: "My Aunt Raped My Uncle"

Musculocutaneous → Axillary → Radial → Median → Ulnar

(Or the polite version: "Meet A Radiologist Monday/Ultimately")

6. Which cord gives which terminal nerve:

Cord	Terminal Branches
Lateral	Musculocutaneous + lateral root of Median
Medial	Ulnar + medial root of Median
Posterior	Axillary + Radial

Mnemonic: "Lateral = Musculo + half Median; Medial = Ulnar + half Median; Posterior = Axillary + Radial"

Key Pre-terminal Branches (to memorize)

Branch	Root	Cord/Trunk
Dorsal scapular nerve	C5	Root
Long thoracic nerve	C5, C6, C7	Roots
Suprascapular nerve	C5, C6	Superior trunk
Nerve to subclavius	C5, C6	Superior trunk
Lateral pectoral	C5–C7	Lateral cord
Medial pectoral	C8, T1	Medial cord
Thoracodorsal	C6–C8	Posterior cord
Axillary	C5, C6	Posterior cord

Quick Clinical Recall

Erb's palsy (C5–C6 injury) → "Waiter's tip" posture — affects shoulder abduction, elbow flexion
Klumpke's palsy (C8–T1 injury) → "Claw hand" + Horner's syndrome — affects intrinsic hand muscles

— Gray's Anatomy for Students, pp. 858–860

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