The
knuckles are the
joints of the
fingers which are brought into prominence when the
hand is clenched and a
fist is made. The word is cognate to similar words in other Germanic languages, such as the Dutch "Knokkel" (knuckle) or German "Knöchel" (ankle), i.e.,
Knöchlein, the diminutive of the
German word for bone (
Knochen). Anatomically, it is said that the knuckles consist of the
metacarpophalangeal (MCP) and
interphalangeal (IP) joints of the finger. The knuckles at the base of the fingers may be referred to as the 1st or major knuckles while the knuckles at the midfinger are known as the 2nd and 3rd, or minor, knuckles. However, the
ordinal terms are used inconsistently, and can be found referring to any of the knuckles.