Correct! Typo! (I can't seem to edit the post now, but yes, I know it has 7)
No, was referring to say, if you damage say, C3, 4 & 5 then you would 'damage' the diaphragm.
So, what would you cause if you damaged say C5 & C6 or just C7 - what about S2, 3 & 4?
Does it make more sense?