As outlined by MedlinePlus, several types of skull fractures can occur in a typical bicycle accident, such as a:

– simple fracture in which there is a crack in the bone, but no damage to the skin;

– linear skull fracture in which there is a fracture in the cranial bone, without depression, splintering or distortion of the bone;

– depressed skull fracture in which there is a fracture in the cranial bone with depression of the bone for the brain; and

– a compound fracture in which the skin may be damaged, and bone may be splintered.