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The clavicle, collarbone, or keybone is a slender, S-shaped long bone approximately 6 inches (15 cm) long [1] that serves as a strut between the shoulder blade and the sternum (breastbone). There are two clavicles, one on each side of the body. The clavicle is the only long bone in the body that lies horizontally. [2]
Complications can include a collection of air in the pleural space surrounding the lung (pneumothorax), injury to the nerves or blood vessels in the area, and an unpleasant appearance. [2] It is often caused by a fall onto a shoulder, outstretched arm, or direct trauma. [1] [3] The fracture can also occur in a baby during childbirth. [1]
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A fully grown adult features 26 bones in the spine, whereas a child can have 33. Cervical vertebrae (7 bones) Thoracic vertebrae (12 bones) Lumbar vertebrae (5 bones) Sacrum (5 bones at birth, fused into one after adolescence) Coccyx (set of 4 bones at birth)
Cleidocranial dysostosis is a general skeletal condition [8] so named from the collarbone (cleido-) and cranium deformities which people with it often have. People with the condition usually present with a painless swelling in the area of the clavicles at 2 to 3 years of age. [ 9 ]
It is usually reserved today for a necklace that lies flat to the body rather than hanging freely, and it rests directly above the collar bone. In contemporary fine jewelry, collar necklaces are 14 inches in chain length and look similar to a collar on a shirt. In street fashion, collars are more commonly referred to as dog collars.