Car accident.. what parts of your body had the trauma?

just because it isn't obvious at the time or right away..doesn't mean that no injury happened.

head/neck/shoulder??
possible upper cervical misalignment {c1/c2} or {also called atlas /axis}
http://www.upcspine.com/self.htm

more-
http://www.google.com/#hl=en&source=...07e9ccc08a197a