Originally Posted by Boeing

A feature unique to the 777-300ER and 777-300 flight deck is the Ground Maneuver Camera System (GMCS), designed to assist the pilot in ground maneuvering of the 777-300 with camera views of the nose gear and main gear areas. The cameras are on the leading edge of the left and right horizontal stabilizers and the underside of the fuselage and are used during ground maneuvering. The images are displayed at the Multi-Functional Display positions in the flight deck in a three-way split format.

Originally Posted by reeg2

I believe the TR from Mizzou Miles mentions that he saw cams in the cockpit - Pilot indicated they were due to the wingspan.

So they're on the 77w, just not visible.