Upper trunk

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Upper trunk
Details
Latin truncus superior plexus brachialis
Identifiers
Dorlands
/Elsevier
t_20/12826113
TA A14.2.03.004
FMA 65216
Anatomical terms of neuroanatomy

The upper trunk (or superior trunk) is a trunk of the brachial plexus which derives from the C5 and C6 roots.

Damage to the upper trunk causes: Arm hangs by side, Elbow cannot flex, Arm medially rotated, Forearm pronated, ‘waiter’s tip’, Loss of sensation over deltoid (C5) and lateral upper limb (C6).

The suprascapular nerve (C5,C6) arises from the upper trunk of the brachial plexus beneath the fascial floor of the posterior triangle, before it passes beneath the transverse scapular ligament and round the lateral border of the scapular spine.

The musculocutaneous and median nerves derive largely from this trunk.

Additional images[edit]