It consists of a central part called head and the stems. At the end of the stems we find the fork tips.
In recent times are spreading forks with straight stems that distribute the fatigue of the fork on the whole structure and not just at a precise point. It’s so more decisive in the curves giving a feeling of greater safety of the vehicle.
Sources:
http://www.cyclinside.it/web/category/componenti/
http://www.albanesi.it/corsa/ciclismo.htm