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Clavicle

 

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Summary

DESCRIPTION:  The clavicle is the collar bone. It is part of the pectoral girdle and assists in swinging the upper limb away from the trunk. This is a major adaptation of the primates who climb trees as in brachiation. The clavicle is placed directly below the skin of the shoulder region.

It is divided into a lateral 1/3 and a medial 2/3. The lateral 1/3 is flat, while the medial 2/3 is cylindrical. It has two ends- the lateral end is the clavicular end while the medial is the sternal end.

BORDERS: Anterior and posterior borders

SURFACES: Lateral 1/3 superior and inferior surfaces; medial 2/3 four surfaces- anterior, posterior, superior and inferior.

BLOOD SUPPLY: Clavicular branch of thoracoacromial artery

OSSIFICATION CENTERS: Primary ossification centers  of the clavicle appear before any bone in two medial and lateral centers at 5th to 6th weeks of gestation. It ossifies in precartilage. Secondary centers appear at puberty.

 

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