The probe is pointing to the styloid process, which is a very pointy, stylus-shaped piece of bone. The styloid process in this photo is view from the underside of the skull, and it can be easily seen as the pointed protuberance directly below (inferior to) the external auditory meatus of a temporal bone.
FYI - the mastoid process is located directly lateral to the styloid process. In the photo above, the mastoid process is the "bump" immediately to the right of the styloid process (and the probe). This is a fairly clear picture of the two processes side-by-side.
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