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 | |
| From | Ventral rami of C5 and C6 |
| To | Anterior division of upper trunk, posterior division of upper trunk, subclavian nerve, suprascapular nerve |
| Identifiers | |
| Latin | truncus superior plexus brachialis |
| TA98 | A14.2.03.004 |
| TA2 | 6398 |
| FMA | 65216 |
| Anatomical terms of neuroanatomy | |
The branches of the upper trunk from proximal to distal are:
- subclavian nerve (C5-C6)
- suprascapular nerve (C5-C6)
- anterior division of upper trunk (C5-C6, forms part of lateral cord)
- posterior division of upper trunk (C5-C6, forms part of posterior cord)
The axillary, radial, musculocutaneous and median nerves all contain axons derived from the upper trunk.
Additional images
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Brachial plexus. Deep dissection. -
Brachial plexus. Deep dissection. Anterolateral view
