How many knuckles in a hand

The 2 rows of carpal bones are connected to 2 bones of the arm--the ulna bone and the radius bone. Numerous muscles, ligaments, tendons, and sheaths can be found within the hand. The muscles are the structures that can contract, allowing movement of the bones in the hand. The ligaments are fibrous tissues that help bind together the joints in the hand. The sheaths are tubular structures that surround part of the fingers.

The tendons connect muscles in the arm or hand to the bone to allow movement. Repetitive use does however frequently lead to injuries. The Ulna is the larger of the two forearm bones, although it tapers at the wrist end, to become narrower than the Radius at this point. The Radius is positioned on the thumb side of the wrist, and the ulna on the little finger side. They form the wrist joint with the carpal bones. Altogether there are 8 carpal bone which are arranged in two rows, proximal and distal.

The scaphoid bone crosses both rows as it is the largest carpal bone. The scaphoid and the lunate are the two bones which actually articulate with the radius and ulna to form the wrist joint. The human hand consists of a broad palm metacarpus with 5 digits, attached to the forearm by a joint called the wrist carpus. The four fingers on the hand are used for the outermost performance; these four digits can be folded over the palm which allows the grasping of objects.

Each finger, starting with the one closest to the thumb, has a colloquial name to distinguish it from the others. Get involved with the arthritis community. Every gift to the Arthritis Foundation will help people with arthritis across the U. Join us and become a Champion of Yes. There are many volunteer opportunities available. Take part to be among those changing lives today and changing the future of arthritis.

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