defined sholders

hi i was woundering how to work your delts (thats lik the top part of the arm, begining of shoulders right?) and how to get the muscle that is in between there and the neck to be definded. (you know that bump thats on both sides of the neck that you see on the pros) I'd appreciated any suggestions.
 
 
thanx ethan01 the traps was what i was talking about, but i already found that out, well anyways thanks alot. :)
 
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