Do introverted functions communicate?

[Hope]

Information Elements extraverted are focused in the external things and is prone to move in that way and communicate or interact.

Do you think that Introverted Functions really communicate with the external world or they always rely in the extroverted function of the block for providing information?

I.e. In a Si Te, does Si truly communicates with the external world or its information is just transfered to the next function (Te) to communicate information in a subdued way?

I've had the impression recently that just extraverted elements does the task of communicating with the external world.

What do you think?