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Brachial plexus Injury
Brachial plexus
Sequence (mnemonic):
Robert Taylor Drinks Cold Beer (Rami, Trunks, Divisions, Cords & Branches)
Positions:
The
roots and trunks
lie in the
posterior triangle
of the neck.
The
divisions
are deep to the
clavicle
.
The
cords
are posterior to the
pectoralis minor
Terminal branches
begin in the
axilla
.
Roots (5)
Are formed by the ven
tral rami of spinal nerves C5 - T1.
Trunks (3)
The 5th and 6th cervical roots join to form the
upper trunk
.
The 7th cervical root forms the
middle trunk
.
The 8th cervical and 1st thoracic roots join to form the
lower trunk
.
Divisions (6)
Each trunk divides into an anterior and a posterior division.
Cords (3)
The
three posterior divisions
join to form the posterior
cord
(C5-T1)
The
anterior divisions
of the
upper and middle trunk
unite to form the
lateral cord
(C5-C7).
The
anterior division
of the
lower trunk
continues alone as the medial cord (only C8-T1).
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