Upper trunk
| Upper trunk | |
|---|---|
| Details | |
| Latin | truncus superior plexus brachialis |
| Identifiers | |
| Dorlands /Elsevier |
t_20/12826113 |
| TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of neuroanatomy
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]
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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
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Brachial plexus.Deep dissection.
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Brachial plexus.Deep dissection.Anterolateral view
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