I assume you mean the built-in trackpad and keyboard. They are USB devices and should be listed in the USB section of System Profiler, probably as "Apple Internal Keyboard / Trackpad". If you don't see this listed, then the system is not seeing them, probably because of a loose cable.
You could try rebooting and resetting the SMU for your machine (different ways of doing this for different machines; search Apple support for instructions). If this doesn't work, it's a loose or disconnected top case cable. If you want to fix it yourself, go to iFixit.com for a teardown of your machine. It shouldn't be too difficult if you have the right screwdrivers.
Steve