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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] Together with the shoulder blade, it makes up the shoulder girdle. It is a palpable bone and, in people who have less fat in this region, the location of the bone is clearly visible.
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.
Clavicles (collarbones) can be partly missing leaving only the medial part of the bone. In 10% of cases, they are completely missing. [ 10 ] If the collarbones are completely missing or reduced to small vestiges , this allows hypermobility of the shoulders including ability to touch the shoulders together in front of the chest. [ 11 ]
The sternoclavicular joint allows movement of the clavicle in three planes, predominantly in the anteroposterior and vertical planes, although some rotation also occurs. A description of movement would be elevation and depression.
The sternum is a narrow, flat bone, forming the middle portion of the front of the chest. The top of the sternum supports the clavicles (collarbones) and its edges join with the costal cartilages of the first two pairs of ribs. The inner surface of the sternum is also the attachment of the sternopericardial ligaments. [2]
New revelations. Each time researchers study the remains of the crew, they glean new insights, such as the diverse backgrounds of some of the crew members. “The fact that this research has ...
Watching the evacuation zone narrow in on our little 8-block radius. It took until 4 a.m. for it to turn red. All the while, tossing and turning with a stomach-churning anxiety I’ve never ...
Other abnormalities involve the head and face, teeth, collar bones, skin, and nails. The front and back of the head are prominent. Within the open sutures of the skull, there may be many small bones (called wormian bones). The midface is less full than usual. The nose is prominent. The jaw can be small. The palate is narrow and grooved.