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

Table 1 Frequency of subscapular nerves origins.

*Upper subscapular*	*n (%)*
From posterior cord (usual)	19 (33.9)
From axillary	3(5.4)
From PD of ST	28 (50)
From ST and MT	2 (3.6)
From others: suprascapular or C8	4 (7.1)
*Lower subscapular*	*n (%)*
From posterior cord (usual)	18 (31.6)
From axillary	31 (54.4)
From radial	1 (1.7)
From thoracodorsal	7 (12.3)
*Thoracodorsal*	*n (%)*
From posterior cord (usual)	44 (78.6)
From radial	5 (8.9)
From MT	2 (3.6)
From axillary	5 (8.9)
*Accessory subscapular*	*n (%)*
From posterior cord	12 (21.1)
From ST	6 (10.6)
From axillary	4 (7)
Absent	35 (61.3)