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  2. Clavicle - Wikipedia

    en.wikipedia.org/wiki/Clavicle

    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]

  3. List of bones of the human skeleton - Wikipedia

    en.wikipedia.org/wiki/List_of_bones_of_the_human...

    It is composed of 270 bones at the time of birth, [2] but later decreases to 206: 80 bones in the axial skeleton and 126 bones in the appendicular skeleton. 172 of 206 bones are part of a pair and the remaining 34 are unpaired. [3] Many small accessory bones, such as sesamoid bones, are not included in this.

  4. Shoulder - Wikipedia

    en.wikipedia.org/wiki/Shoulder

    Depending on locomotor style, a bone connects the shoulder girdle to the trunk in some animals; the coracoid bone in reptiles and birds, and the clavicle in primates and bats. In primates, the shoulder shows characteristics that differ from other mammals, including a well developed clavicle, a dorsally shifted scapula with prominent acromion ...

  5. Shoulder girdle - Wikipedia

    en.wikipedia.org/wiki/Shoulder_girdle

    The shoulder girdle or pectoral girdle is the set of bones in the appendicular skeleton which connects to the arm on each side. In humans, it consists of the clavicle and scapula; in those species with three bones in the shoulder, it consists of the clavicle, scapula, and coracoid.

  6. Cleidocranial dysostosis - Wikipedia

    en.wikipedia.org/wiki/Cleidocranial_dysostosis

    Female child patient described by Marie and Sainton, 1898, showing absence of clavicles. Cleidocranial dysostosis is a general skeletal condition [8] so named from the collarbone (cleido-) and cranium deformities which people with it often have.

  7. Sternoclavicular joint - Wikipedia

    en.wikipedia.org/wiki/Sternoclavicular_joint

    The joint is formed by the sternal end of the clavicle, the clavicular notch of the sternum, and (the superior surface of) the costal cartilage of the first rib. [1] The articular surface of the clavicle is larger than that of the sternum, and is invested with a layer of cartilage, which is considerably thicker than that of the sternum. [1]

  8. Scapula - Wikipedia

    en.wikipedia.org/wiki/Scapula

    The scapula (pl.: scapulae or scapulas [1]), also known as the shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on either side of the body being roughly a mirror image of the other.

  9. Acromion - Wikipedia

    en.wikipedia.org/wiki/Acromion

    However, in between 1% and 15% of cases, this osseous union fails and the acromion remains separate as an accessory bone. This condition is referred to as os acromiale , but rarely causes pain. Earlier estimates of its prevalence were as low as 1.4%, and this higher estimate was made by Sammarco in the year 2000, based on radiographic and ...