F-1 Engine LOX Dome
The F-1 rocket engine's LOX dome (aka "oxidizer dome") routes high-pressure liquid oxygen (LOX) from the turbopump to the injector, where it is mixed with fuel and subsequently burned.
The LOX dome is located at the forward end of the engine, between the gimbal bearing and the injector:
A more detailed diagram of the LOX dome itself:
The only vintage picture or diagram I've been able to find of the aft-facing end of the LOX dome appears below (LOX dome located in center of the photo, in front of the thrust chamber's yellow dolly).
Note the arrangement of larger holes around the periphery of the LOX dome face; compare with the holes in the video capture above; note how the two holes at about the 11:00 position are closer together. Also note the 16 smaller-diameter holes closer to the center of dome face (alternating with the slots). These appear to correspond with the 16 inner dome attach bolts, in both the diagram above and the photo of forward end of the LOX dome above.
Thanks to Vince Wheelock for providing invaluable research and insight into the F-107-1 LOX dome issue.