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Fibrous dysplasia is an uncommon bone disorder in which scar-like (fibrous) tissue develops in place of normal bone. This can weaken the affected bone and cause it to deform or fracture. In most cases, fibrous dysplasia affects only a single bone — most commonly the skull or a long bone in the arms or legs.

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The humerus is essential for movement because it is the site of many muscle and ligament attachments. Find out the uses and function of our forearm bones http://www.learnbones.com/arm-bones-anatomy/

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The ulna is a bone in the human forearm. Broader near the elbow and tapering as it approaches the wrist, it is situated alongside the radius bone on the pinky-finger side of the arm. This bone’s structure reflects its function, as it forms three major joints in the arm, two with the parallel radius bone and one with the humerus bone in the upper arm. The latter of these is the elbow joint, and it is the crescent wrench shape of the top of the ulna that makes flexion and extension, or bending…

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This photo illustrates the four types of bones found in the human body. The major bones of the arms (humerus, radius, ulna) and the legs (tibula, fibula, femur) are all long bones. Short bones have a tubular shaft and articular ends like long bones, but are much smaller. They include the metatarsals and metacarpals. Flat bones are thin with broad surfaces and include the ribs, sternum, and scapula. Irregular bones are irregular in size and shape & include the vertebrae, carpal, and tarsal…

The radius is the bone of the forearm or lower arm, extending from the elbow to the wrist. This bone is relatively long and curved, extending parallel to the ulna. http://www.learnbones.com/arm-bones-anatomy/

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The two shoulders are located beneath the head connecting the arm and the chest. Each shoulder consists of 2 bones, the clavicle and the scapula, and collectively both shoulders account for 4 bones in the body. http://www.learnbones.com/shoulder-bones-anatomy/

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Fractures can affect most bones of the body, but they mostly involve the hips, vertebrae, wrist, and arms. Fractures can be very painful and very debilitating. The bones can become so weak that a sneeze or a cough could result in a vertebral fracture.

The two shoulders are located beneath the head connecting the arm and the chest. Each shoulder consists of 2 bones, the clavicle and the scapula, and collectively both shoulders account for 4 bones in the body. http://www.learnbones.com/shoulder-bones-anatomy/

Did you know? Whales’ flippers, or pectoral fins, share bone structure with the human arm and hand. In fact, the bones of cetacean flippers are the same kinds of bones as in the human arm, with an upper arm bone, two forearm bones, and hand, wrist, and finger bones. In whales, fingers are elongated and may have additional bones.

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A LIVING DINO-BIRD; THE HOATZIN! Larval hoatzins use an evo shortcut called NEOTYNY to survive! In the Amazon's FLOODED FOREST, hoatzin nestlings in 1st 2 weeks of life are menaced by SNAKES. During spring floods, snakes swim up to the branches to snag hoatzin chicks. So, before their arm bones fuse into wing bones, the chicks get DINOSAUR ARM BONES and swing in the branches like monkeys. The arm bones are EXACTLY bone for bone like dinonychus or archeopteryx!

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