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Table 2 Frequency of origins of long thoracic, suprascapular and dorsal scapular nerves.

From: Variations of the origin of collateral branches emerging from the posterior aspect of the brachial plexus

Long thoracic n (%)
From C5, C6, C7 -above the 1st rib (early union) – (usual) 11 (20.4)
From C5, C6, C7 -above the 3rd rib (late union) 6 (11.1)
C5 (dorsal scapular common trunk), C6, C7-(early union) 7 (13.0)
C5 (dorsal scapular common trunk), C6, C7-(late union) 12 (22.2)
C5 not supplying 6 (11.1)
C7 not supplying 10 (18.5)
without union (C5, C6 + C7/C5 + C6, C7) 2 (3.7)
Suprascapular n (%)
From ST (usual) 47 (82.4)
From C5 9 (15.8)
From C5 and ST 1 (1.8)
Dorsal scapular n (%)
From unique ramus (usual) 10 (17.9)
From common trunk with long thoracic 17 (30.4)
From C4 16 (28.6)
From C4, C5 13 (23.1)