User blog comment:Arbington/New ME4 Teaser Pics, Possible Upcoming Reveal/@comment-1679409-20131114091848/@comment-74.83.241.70-20131114142412

If the armor less Turian picture means anything, it seems that that neck piece acts similarly to an early Ceratopsian's frill in reverse, protecting the back of the neck from attack by predators. I could be conjuring up a pile of nothing, but that's my interpretation of what I've seen.