The upper (superior) trunk is part of the brachial plexus. It is formed by joining of the ventral rami of the fifth (C5) and sixth (C6) cervical nerves. The upper trunk divides into an anterior and posterior division.

Upper trunk
Details
FromVentral rami of C5 and C6
ToAnterior division of upper trunk, posterior division of upper trunk, subclavian nerve, suprascapular nerve
Identifiers
Latintruncus superior plexus brachialis
TA98A14.2.03.004
TA26398
FMA65216
Anatomical terms of neuroanatomy

The branches of the upper trunk from proximal to distal are:

The axillary, radial, musculocutaneous and median nerves all contain axons derived from the upper trunk.

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