Ok, so here is a break down of the types of fuel injection.
There are two major types, as you already noted. Direct and indirect. Indirect has several sub-types.
Direct injection has the injector stuck directly into the cylinder, pointing at the piston, kind of like a spark plug is.
Forms of indirect injection:
Indirect injection as it is used with diesels (DI vs IDI 7.3s for example) still have the injector sticking into the cylinder, but instead of pointing straight at the piston it shoots into a small chamber in the combustion chamber part of the head.
Ported injection, or Multi port injection is when you have multiple injectors (usually one per cylinder) shooting at the back of the intake valve, right at the end of the runner. This is what you have.
Spider injection, is a Chevy-specific stupid version of ported injection. The injectors are in the intake, and each is fed individually by a tube running through the intake. It is called spider injection because the unit kind of looks like a spider.
Throttle body or Central fuel injection (TBI or CFI) is more like a carb than it is fuel injection. You have one or two injectors shooting fuel in at a vertical throttle body, similar to how the jets in a carb work. The only difference there is that rather than rely on venturi vacuum to draw the fuel in you have pressure from the pump pushing it and spraying for better atomization, and the injectors can be opened to closed dynamically so it can effectively re-jet on the go. This eliminates the need for secondaries, primaries, and having to tune the carb periodically.