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If the origin of the subscapular nerve is the posterior cord of the brachial plexus, and the posterior cord is formed by the posterior division of the three trunks (superior, medial and inferior) which in turn are formed by the five roots of the brachial plexus, how come the superior subscapular (or the thoracodorsal and inferior subscapular for that matter) are not said to be originated from all of the five roots? — Preceding unsigned comment added by 200.202.249.82 (talk) 00:13, 30 June 2013 (UTC)[reply]
Because, each root is formed by a bunch of axons, wich some divide to the anterior divition, and others to the posterior divitions. Those in the posterior divition form the posterior cord. BUT, only some of those axons "go out" from the cord as a nerve, but others keep their way straight to form the radial or axilar nerve.
This means that just some of the posterior cord axons are going to "come out" to from the the subscapular nerves, and in this case, those axons are just coming from c5 and c6. This is sometimes represented in some squemathic views.
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