Nail (anatomy) - Wikipedia
File:Extra phalangeal crease.jpg - Wikipedia
Mysterious_Muthrfckr The first documented appearance of the finger
Mallet Finger - H. GRAHAM STACK, 1969
Galileo's Middle Finger, 100 Wonders
What does it mean, in the USA, if someone is holding their thumb, middle finger, and pinky up at the same time? - Quora
The first documented appearance of the finger in the United States
Joint cracking - Wikipedia
Pinky ring - Wikipedia