If you are talking about from the engine firewall to the accelerator pedal, it is a cable that passes through the center tunnel in a tube.
If you are talking about how it connects to the TB, it is routed from the firewall thu a hole in the passenger side engine tin, up to the TB where it secured in a bracket (sheathing) and the cable itself to a barrel nut in the TB linkage.
Shit that was tough to type .... backspace.................