Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Variations of cranially (positive) and caudally (negative) directed peak thru-plane velocities in baseline and dynamic models at two representative axial planes (P1 and P4) along the upper cervical SAS (planes positions are shown in Figure 1).
