The circulation route has a forward route and a return route located under the forward route.

A hydraulic oil flow path has a first flow path and a second flow path.

The loop includes an electrical path and an optical path.

The head end portion includes an exhaust gas path, a fuel path, and an oxidant path.

The neural communication impairment is present in a neural pathway, which can be a cortico-neuromuscular pathway, an intra-brain neural pathway, or in a sensory-cortico pathway.

Each section includes an input path and an output path.

The route search means searches for a route up to a destination and determines a guidance route.

The pseudo virtual path includes a special token that identifies a path to be a pseudo virtual path.

In various embodiments, the user-defined path can be a non-linear path or a curved path.

The compressor has an upstream path and a downstream path.

The turbine has an upstream path and a downstream path.

A neuromimetic device includes a feedforward pathway and a feedback pathway.

In the cylinder head (22B), there are provided a path (22c) doubling as both a suction path and a discharge path, a discharge path (22d), a pressure introduction path (22e), and a suction path (22f).

There is provided a heat flow path (28) that follows the flow path (14).

A flow path is formed in the flow path member.