explain muscle born tendence
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The muscles in the forearm and palm (thenar muscles) all work together to keep the wrist and hand moving, stable, and aligned. The image below shows the bones from the back side of the hand. The red lines show where the tendons attach the muscles to the bones.
The muscles that move the fingers and thumb are above the wrist in the forearm. Long flexor tendons extend from the forearm muscles through the wrist and attach to the small bones of the fingers and thumb. When you bend or straighten your finger, these flexor tendon slide through a snug tunnel, called the tendon sheath, that keeps the tendon in place next to the bones.
The muscles that move the fingers and thumb are above the wrist in the forearm. Long flexor tendons extend from the forearm muscles through the wrist and attach to the small bones of the fingers and thumb. When you bend or straighten your finger, these flexor tendon slide through a snug tunnel, called the tendon sheath, that keeps the tendon in place next to the bones.
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The wrist links the hand to the arm. The wrist is a complex mechanical system of 8 small bones known as the carpal bones. The carpal bones are arranged in 2 interrelated rows. One row connects with the ends of the bones in the forearm—radius and ulna. If you hold your hand in the thumbs-up position, the bone on the top of your forearm is the radius; the one on the bottom is the ulna.
The other row of carpal bones connects with the bones of the palm of the hand. There are synovial joints between the carpal bones and the wrist. The joint surfaces, where the bones meet, are covered with articular cartilage which helps movement.
Knuckle cracking does not serve any beneficial purpose and may be harmful to the fingers due to the stretching of the joint capsule. The hand has 19 bones: 5 elongated metacar
pal bones, which are next to the wrist and make up the palm; 14 phalanges which make up the fingers. Each finger has 3 phalanges, the thumb has 2. These 19 bones collectively form 14 separate joints. The knuckle joints, metacarpophalangeal (MCP) joints, join the fingers to the palm. The interphalangeal (IP) joints are the finger joints. There are synovial joints between the metacarpals and phalanges—these bones are also covered with articular cartilage.
The other row of carpal bones connects with the bones of the palm of the hand. There are synovial joints between the carpal bones and the wrist. The joint surfaces, where the bones meet, are covered with articular cartilage which helps movement.
Knuckle cracking does not serve any beneficial purpose and may be harmful to the fingers due to the stretching of the joint capsule. The hand has 19 bones: 5 elongated metacar
pal bones, which are next to the wrist and make up the palm; 14 phalanges which make up the fingers. Each finger has 3 phalanges, the thumb has 2. These 19 bones collectively form 14 separate joints. The knuckle joints, metacarpophalangeal (MCP) joints, join the fingers to the palm. The interphalangeal (IP) joints are the finger joints. There are synovial joints between the metacarpals and phalanges—these bones are also covered with articular cartilage.
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