The Truss Rod is a metal rod that holds the neck of the guitar in tension to prevent is warping out of true. At the end of the finger board is the NUT - the plastic piece that keeps the strings seperate - just beyond this should be an access hole for the Allen-key/hexagonal wrench that is used to adjust the truss-rod.

On many guitars this hole is covered by a piece of plastic held in place by 3 screws. However, on the Strat it is usually open - as I recall - or plugged with a small cap. A hole is better IMO.

BTW - there is a plate on the back of the body to allow access to the bridge tensioning springs - the power behind the whammy bar.

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