BONES OF THE THORAX
The thorax is formed behind by the thoracic or dorsal vertebrae anteriorly by the sternum and costal cartilages and the remainder of the circumference by the ribs
THE STERNUM::
This is an almost flat dagger shaped bone which has a slightly convex anterior surface and a slightly concave posterior surface the sternum is divided into three points ;(a) the manubrium (b) the mesosternum or body and (c) the xiphoid process
the manubrium is roughly triangular and it articulates on either side with the clavicle and the first and second costal cartilages the body is attached to 3rd to 6th ribs attached at intervals the xiphoid process sometimes remains cartilagenous but is usually ossified partly in adults
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