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The knuckles are the joints of the fingers. 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).
The one closest to the MCP joint (knuckle) is called the proximal IP joint (PIP joint). The joint near the end of the finger is called the distal IP joint (DIP joint). The thumb only has one IP joint between the two thumb phalanges.
Metacarpophalangeal joint (MCP): Also called the knuckle, this is where the proximal phalanx in each finger meets an adjacent hand bone (metacarpal bones). Proximal interphalangeal joint (PIP): This is the joint in the middle of the finger, connecting the proximal and middle phalanges.
Each finger comprises three small bones called phalanges, which give the finger its shape and strength. These bones are connected by joints and surrounded by a network of muscles, tendons, and ligaments, which allows smooth and coordinated movement.
Finger Joints (Knuckles) Each finger contains 3 joints, more commonly known as knuckles. The thumb has two knuckle joints. The largest joint of each finger lies between the finger and the hand. This first joint at the base of the finger is called the metacarpophalangeal joint (MCP). It works like a hinge when you straighten your fingers and thumb.
On the back of the hand, where the knuckles form, a flat, triangular area becomes visible just before the fingers. The knuckle’s raised prominence comes from the rounded heads of the metacarpal bones, which meet the finger bones at the metacarpophalangeal joints.
Proximal phalanx. The two terms distal and proximal mean “towards the tip” and “towards the body”, respectively. You can apply this terminology to other parts of the body, like the foot (the toes are distal to the ankle, or the knee is proximal to the toenail). The thumb has only two segments: Distal phalanx. Proximal phalanx.
The hand is composed of many different bones, muscles, and ligaments that allow for a large amount of movement and dexterity. There are three major types of bones in the hand itself: Phalanges. These 14 bones are found in the fingers of each hand and also in the toes of each foot.
noun. knuck· le ˈnə-kəl. 1. a. : the rounded prominence formed by the ends of the two adjacent bones at a jointused especially of those at the joints of the fingers. b. : the joint of a knuckle. 2. : a cut of meat consisting of the tarsal or carpal joint with the adjoining flesh. 3. : something resembling a knuckle: such as. a (1)
Metacarpophalangeal Joint (MCP): The MP joint is where the hand bone meets the finger bone, referred to as the “knuckle.” These joints are very important, allowing us to bend/flex and spread our fingers.