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.
(A) Left lateral view photograph; (B) left lateral view line drawing; (C) right lateral view photograph; (D) right lateral view line drawing. Refer to the main text for the abbreviations list.
