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Muscles of the fingers can be subdivided into extrinsic and intrinsic muscles. The extrinsic muscles are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm. The fingers have two long flexors, located on the underside of the forearm. They insert by tendons to the phalanges of the fingers.
- Thumb. Different from the other four digits in that it’s shorter and wider and only has two phalanges instead of three, the thumb earned its name from a description of its physical characteristics in relation to its neighbors.
- Index/Pointer Finger. Next in line after the pollex is the digitus secundus manus. Index comes from the Latin indicō, which means “to point out”; that’s also where the term pointer comes into play.
- Middle Finger. The second finger (third digit) has the most literal meaning of all. Less commonly referred to as the long or tall finger, the digitus medius manus sits in the center of the hand, right between the digitus secondus manus and the ring finger.
- Ring Finger. Known medically as the digitus medicinalis, digitus quartus manus, or digitus annularis manus, the origin of the term ring finger dates back to 2nd century Egypt and has to do with the heart.
Jan 7, 2024 · Polydactyly means having extra fingers or toes. The extra finger or toe might be a small nub or extra tissue, or it might be a functioning digit with nerve endings, joints, and bone. An extra finger might be attached to extra joints or an extra bone. Syndactyly is webbing or fusion of the fingers or toes.
- Lana Barhum
Anatomy of the Hand. The hand is composed of many different bones, muscles, and ligaments that allow for a large amount of movement and dexterity. There are 3 major types of bones in the hand itself, including: Phalanges. The 14 bones that are found in the fingers of each hand and also in the toes of each foot.
Fingers. Fingers are the slender, jointed extensions at the end of the human hand. Typically, people have five fingers on each hand. They allow us to grasp objects, perform intricate tasks, and sense touch through the numerous nerves embedded in their structure.
- The names of the fingers on the hand are the thumb, index finger, middle finger, ring finger, and pinky finger.
- The fourth finger is called the ring finger because traditionally people wore their wedding or engagement rings on the fourth finger.
- The pinky finger helps with gripping, balancing, and coordinating delicate tasks. It contributes to overall hand stability and plays a role in our...
- Fingernails protect fingertips, improve grip for tasks, aid in scratching, and contribute to our sense of touch.
- Knuckles are joints in your hand that help your fingers move. They allow you to bend and straighten your fingers, making it easier to grip and do t...
Jun 7, 2024 · Learn about the structure and function of the hand, a grasping organ with great mobility and flexibility. The hand has a fully opposable thumb and four fingers, each with three phalanges, and is covered by fingernails and palm prints.
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Jun 12, 2023 · Learn about the bones, muscles, nerves, tendons and ligaments that make up your hand and wrist. Find out how they help you move, touch and interact with the world.
