Answer:
Bow. It is characterized in that it lacks deltas and its crests run from one side to the other without turning back on themselves.
Internal loop. It is characterized by having a delta to the right of the observer; the papillary crests that form the nucleus are born on the left, run to the right, turning on themselves, to come out on the same side as the starting point.
External clip. It is characterized by having a delta to the observer's left, the papillary ridges that form the nucleus are born on the right and run to the left, turning on themselves, to come out on the same side as the starting point.
Whorl. It is characterized in that it has two deltas, one on the right and one on the left; their nuclei adopt ovoid destrogyrate or synestrogyre spiroidal shapes, concentric ovoid circles concentric in S or in Z.