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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.
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 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.
Steel collar to protect the neck and cover the neck opening in a complete cuirass. Quite unlike a modern shirt collar in that as well as covering the front and back of the neck it also covers part of the clavicles and sternum and a like area on the back. Standard, pixane, or bishop's mantle: A mail or leather collar.
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]
Shankland was interested in the idea of studying clavicles, or collarbones, from the shipwreck because the bones showcase unique characteristics related to age, development and growth.
The midface is less full than usual. The nose is prominent. The jaw can be small. The palate is narrow and grooved. There will be delay in fall of milk teeth. The permanent teeth can also be slow to appear. The permanent teeth are commonly irregular and teeth may be missing . The collar bones are often underdeveloped and malformed.
The upper limbs or upper extremities are the forelimbs of an upright-postured tetrapod vertebrate, extending from the scapulae and clavicles down to and including the digits, including all the musculatures and ligaments involved with the shoulder, elbow, wrist and knuckle joints. [1]