May have accidentally bent this cable - What does it control?

Just installed a SSD in my MacBook Pro 13" Unibody Mid-2009. I also chose to remove my optical drive and install a hard drive in its place. While doing the installation, I had some trouble re-inserting a cable, and fear that I may have inadvertently bent it slightly. It's a large/fairly thick cable near the fan on the motherobard; I had to remove it in order to access a screw that's underneath it.

The machine *appears* to be working fine, everything I've tested so far (sound, wifi, etc.) appears to be working as it should. What is this cable for (i.e. is there something I can test to see if it's working or not)?

Picture of the cable I'm talking about is below. Thanks!