The knuckles in our fingers include the metacarpophalangeal (MCP) joint, where the hand bone connects to the first finger bone, the proximal interphalangeal (PIP) joint, the middle joint which ...

Galen dissecting a monkey, Veloso Salgado (1906). wikimedia It wasn’t until the 14th century that anatomy and medical science advanced thanks to the start of systematic human cadaver dissections.