Audio/Mic range

Hello,

So I have a question and an idea, but I'm not sure how to go about it. My iMac is situated far back on my desk. I always prefer my monitor farther away from me. However, the back of the iMac is where we plug in headphones and/or mic. Is there any device that we can use that will allow me to plug in my headphones/mic into? Like an extension of sorts?

If it's an actual device, I would like to know if it'd be possible/practical, to attach it underneath my desk, to the side, or just leave it on the top of the desk. Does anyone have any suggestions or similar set ups?